US4076831A

US4076831A - Pyrano[3,4-b]-indole derivatives, pharmaceutical compositions and methods of use

Info

Publication number: US4076831A
Application number: US05/749,931
Authority: US
Inventors: Christopher A. Demerson; Leslie G. Humber; Thomas A. Dobson; Ivo L. Jirkovsky
Original assignee: American Home Products Corp
Current assignee: Wyeth LLC
Priority date: 1972-05-16
Filing date: 1976-12-13
Publication date: 1978-02-28

Abstract

Indole derivatives characterized by having a 1,3,4,9-tetrahydropyrano[3,4-b]indole or 1,3,4,9-tetrahydrothiopyrano[3,4-b]indole nucleus bearing a substituent in position 1, said substituent incorporating an acid, ester or amide function therein, are disclosed. The nucleus is further substituted at position 1 and may be optionally substituted at positions 3, 4, 5, 6, 7, 8, and 9. The derivatives are useful antiinflammatory, analgesic, antibacterial and antifungal agents and methods for their preparation and use are also disclosed.

Description

This is a division of application Ser. No. 555,506, filed Mar. 5, 1975, now U.S. Pat. No. 4,012,417, which Application is a continuation-in-part of our earlier-filed Application Ser. No. 513,693, filed October 10, 1974, now U.S. Pat. No. 3,974,179; which is a continuation-in-part of our earlier-filed Application Ser. No. 311,023, filed November 30, 1972, now abandoned, which is a continuation-in-part of our earlier-filed Application Ser. No. 289,714, filed September 15, 1972, now U.S. Pat. No. 3,939,178, which is a continuation-in-part of our earlier-filed Application Ser. No. 148,895, filed June 1, 1971 (now U.S. Pat. No. 3,843,681, issued October 22, 1974).

BACKGROUND OF THE INVENTION

This invention relates to novel indole derivatives, to processes for their preparation and to intermediates used in these processes.

Notwithstanding the advances made during the last four decades in the development of agents for the treatment of inflammatory conditions, there still remains a need for effective agents without the side effects associated with the therapeutic agents presently used for this purpose.

The indole derivatives of this invention have been found to exhibit interesting and useful pharmacodynamic properties without eliciting undesirable side effects. Notable attributes of this effect are antiinflammatory and analgesic activities. In addition the compounds of this invention exhibit antibacterial and antifungal properties.

SUMMARY OF THE INVENTION

The indole derivatives of this invention are characterized by having a pyrano[3,4-b]indole or thiopyrano[ 3,4-b]indole nucleus bearing a substituent at positon 1, said substituent incorporating an acid, ester or amide function therein. These derivatives may be represented by formula I ##STR1## in which R¹ is selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl, lower cycloalkyl, phenyl, benzyl and 2-thienyl, R², R³, R⁴ and R⁵ are the same or different and are each selected from the group consisting of hydrogen and lower alkyl, R⁶ is selected from the group consisting of hydrogen, lower alkyl, lower cycloalkyl, hydroxy, lower alkoxy, benzyloxy, lower alkanoyloxy, phenyl, nitro, halo, mercapto, lower alkylthio, trifluoromethyl, amino and sulfamoyl, R⁷ is selected from the group consisting of hydrogen, lower alkyl and lower alkenyl, X is selected from the group consisting of oxy and thio, Y is selected from the group consisting of carbonyl, ##STR2## which each of R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ is hydrogen or lower alkyl, and Z is selected from the group consisting of hydroxy, lower alkoxy, amino, lower alkylamino, di(lower)alkylamino and phenylamino.

Also included within the scope of this invention are pyrano[3,4-b]indole and thiopyrano[3,4-b]indole derivatives of formula I in which R⁶ represents from one to four substituents, which may be present simultaneously, at positions 5,6,7 and 8 thereof. The exact nature of such substituents does not have to be limited necessarily by the above definitions of R⁶, and R⁶ may also include additional definitions, for example, mercapto, lower alkylthio, trifluoromethyl and other halo(lower)alkyls, amino and sulfamoyl, provided that any two such substituents do not interfere with each other. Accordingly, the indole derivatives of this invention are represented also be general formula Ia ##STR3## in which R¹, R², R³, R⁴, R⁵, R⁷, X, Y and Z are as defined in the first instance and R^6a, R^6b, R^6c and R^6d are the same or different and each is selected from the group consisting of hydrogen, lower alkyl, lower cycloalkyl, hydroxy, lower alkoxy, benzyloxy, lower alkanoyloxy, phenyl, nitro, halo, mercapto, lower alkylthio, trifluoromethyl, amino and sulfamoyl.

The indole derivatives of this inventon of formula I are prepared by reacting a compound of the formula ##STR4## in which R², R³, R⁴, R⁵, R⁶ and R⁷ are as defined in the first instance and X' is hydroxy or mercapto with a compound of formula ##STR5## in which R¹, Y and Z are as defined in the first instance, in the presence of an acid catalyst.

DETAILED DESCRIPTION OF THE INVENTION

The term "lower alkyl" as used herein contemplates both straight and branched chain alkyl radicals containing from one to six carbon atoms and includes methyl, ethyl, propyl, isopropyl, butyl, isobutyl, 2-methylpentyl and the like.

The term "lower alkenyl" as used herein contemplates both straight and branched chain alkenyl radicals containing from two to six carbon atoms and includes vinyl, allyl, 1-propenyl, methallyl, 2-ethyl-3-butenyl and the like.

The term "lower alkynyl" as used herein contemplates both straight and branched chain alkynyl radicals containing from two to six carbon atoms and includes ethynyl, propargyl, 1,1-dimethylpropargyl and the like.

The term " lower cycloalkyl" as used herein contemplates saturated cyclic hydrocarbon radicals containing from three to six carbon atoms and includes cyclopropyl, cyclobutyl, cyclopentyl and the like.

The term "lower alkoxy" as used herein contemplates both straight and branched chain alkoxy radicals containing from one to four carbon atoms and includes methoxy, ethoxy, isopropoxy and the like.

The term "lower alkanoyloxy" as used herein contemplates both straight and branched chain alkanoyloxy radicals containing from two to six carbon atoms and includes acetoxy, propionyloxy, hexanoyloxy and the like.

The term "halo" as used herein contemplates halogens and includes fluorine, chlorine, bromine and iodine.

Where the term "lower" is used herein as part of the description of alkylamino and dialkylamino, it contemplates one to six carbon atoms for each alkyl group of such a radical and includes methylamino, n-hexylamino, dimethylamino, diethylamino and the like.

The indole derivatives of formula I in which Z is hydroxy, the acid compounds of this invention, form addition salts with suitable inorganic and organic bases. These salts possess the same activities as the parent acid compound when administered to animals and may be utilized in the same manner. Suitable bases to form these salts include, for example, the hydroxides, lower alkoxides, carbonates and bicarbonates of sodium, potassium, calcium and magnesium, as well as the bases, ammonia, triethylamine, benzylamine and the like. The addition salts thus obtained are the functional equivalents of the parent acid compound in respect to their therapeutic use. Hence, these addition salts are included within the scope of this invention and are limited only by the requirement that the bases employed in forming the salts be pharmaceutically acceptable.

Also included within the scope of this invention are the isomers of the compounds of formula I resulting from the asymmetric centers contained therein.

Antiinflammatory and Analgesic Activity

The useful antiinflammatory and analgesic activities of the indole derivatives of this invention may be demonstrated in standard pharmacologic tests, for example, the tests described by R. A. Turner in "Screening Methods in Pharmacology", Academic Press, New York and London, 1965, pp. 152-163 and pp. 100-117, respectively,

More particularly, the antiinflammatory activity of the compounds of this invention may be readily demonstrated in a modification of the Freund's adjuvant test, the adjuvant induced acute edema test as described by J. R. Boissier, et al., Therapie, 25, 43 (1970). This test is known to correlate well with data derived from clinical results with humans. Boissier et al. have demonstrated this correlation with such clinically active compounds as phenylbutazone, mefenamic acid, indomethacin, aspirin, hydrocortisone and prednisolone.

More particularly exemplified, a substantial antiinflammatory effect for the compounds listed below is demonstrable at oral doses of 100 mg/kg or less in this acute edema test. In this test male rats are treated with the test compound one hour before the injection of Freund's adjuvant into the paw (day 0). The rats are then treated with the same dose of the test compound for the next three days. The antiinflammatory effect of the test compound is measured by the reduction of pedal inflammation, see Turner cited above, and expressed as a percent inhibition from adjuvant injected control rats on day 3.

______________________________________                                    
                                 PER-                                     
                        DAILY    CENT                                     
                        DOSE     INHI-                                    
                        MG       BI-                                      
  COMPOUND              /KG)     TION                                     
______________________________________                                    
1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]-                                 
indole-1-acetic acid, Example No. 1                                       
                        100      30                                       
1-ethyl-1,3,4,9-tetrahydropyrano[3,4-b]-                                  
indole-1-acetic acid, Example No. 15                                      
                        100      47                                       
1-propyl-1,3,4,9-tetrahydropyrano[3,4-b]-                                 
indole-1-acetic acid, Example No. 16                                      
                        100      40                                       
8-methyl-1-propyl-1,3,4,9-tetrahydropyrano-                               
[3,4-b]indole-1-acetic acid, Example No. 26                               
                        100      44                                       
1-butyl-1,3,4,9-tetrahydropyrano[3,4-b]-                                  
indole-1-acetic acid, Example No. 25                                      
                        100      40                                       
1-t-butyl-1,3,4,9-tetrahydropyrano[ 3,4-b]-                               
indole-1-acetic acid, Example No. 24                                      
                        100      30                                       
5-methyl-1-propyl-1,3,4,9-                                                
tetrahydropyrano[3,4-b]-                                                  
indole-1-acetic acid, Example 32                                          
                        100      44                                       
1-ethyl-1,3,4,9-                                                          
tetrahydrothiopyrano[3,4-b]indole-                                        
1-acetic acid, Example No. 98                                             
                         25      32                                       
______________________________________

The lack of side effects for the compounds of this invention may be demonstrated by standard acute toxicity tests (see Turner cited above) and by prolonged administration of the compound to warm-blooded animals.

When the present indole derivatives of this invention are employed as antiinflammatory and analgetic agents in warm-blooded animals, e.g., rats, they may be administered orally, alone or in dosage forms, i.e., capsules or tablets, combined with pharmacologically acceptable excipients, such as starch, milk sugar and so forth. They may also be administered orally in the form of solutions in suitable vehicles such as vegetable oils.

The dosage of the indole derivatives of this invention will vary with the particular compound chosen and form of administration. Furthermore, it will vary with the particular host under treatment. Generally, the compounds of this invention are administered at a concentration level that affords protective effects without any deleterious side effects. These antiinflammatorily-analgesically effective concentration levels are usually obtained within a therapeutic range of 1.0 mg to 500 mg/kg per day, with a preferred range of 10 to 100 mg/kg per day.

Antibacterial and Antifungal Activity

The indole derivatives of this invention also exhibit utility as antibacterial agents against a number of gram-positive and gram-negative microorganisms, such as, Staphylococcus pyrogenes, both penicillin sensitive and penicillin resistant, Streptococcus faecalis, Escherichia coli, Aerobacter aerogenes, Salmonella pullorum, Pseudomonas aerugenosa, Proteus mirabilis, Proteus vulgaris, Klebsiella pneumoniae and Serratia marcescens and as antifungal agents against a number of pathogenic fungi such as, Candida albicans, Microsporum gypseum and Trichophyton granulosum, in standard tests for antibacterial and antifungal activity, such as those described in "Antiseptics, Disinfectants, Fungicides and Sterilization", G. F. Reddish, Ed., 2nd ed., Lea and Febiger, Philadelphia, 1957 or by D. C. Grove and W. A. Randall in "Assay Methods of Antibiotics", Med. Encycl. Inc., New York 1955.

For example, by employing a test like the serial broth dilution test, see Grove and Randall, cited above, in which dilutions of the compounds of this invention in nutrient broth are inoculated with the microorganisms or fungi, described above, incubated at 37° C. for 2 days, respectively, and examined for the presence of growth, it may be shown that 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-propionic acid is able to inhibit growth totally in this system of Proteus vulgaris, Klebsiella pneumoniae and Serratia marcescens at a concentration of 100 mcg/ml. or less.

When the comounds of this invention are employed as antibiotic or antifungal agents in warm-blooded animals, e.g. rats, they may be administered alone or in combination with pharmacologically acceptable carriers. The proportion of the compound is determined by the solubility and chemical nature of the compound, chosen route of administration and standard biological practice. For example, they may be administered orally in solid form containing such excipients as starch, milk sugar, certain types of clay and so forth. They may also be administered orally in the form of solutions or they may be injected parenterally. For parenteral administration they may be used in the form of a sterile solution containing other solutes, for example, enough saline or glucose to make the solution isotonic.

The dosage of the present therapeutic agents as antibiotic or antifungal agents will vary with the form of administration and the particular compound chosen. Furthermore, it will vary with the particular host under treatment. Generally, treatment is initiated with small dosages substantially less than the optimum dose of the compound. Thereafter, the dosage is increased by small increments until the optimum effect under the circumstances is reached. In general, the compounds of this invention are most desirably administered at a concentration level that will generally afford antibacterially or antifungally effective results without causing any harmful or deleterious side effects and preferably at a level that is in a range of from about 1.0 mg. to about 1000 mg. per kilo per day, although as aforementioned variations will occur. However, a dosage level that is in the range of from about 10 mg. to about 500 mg. per kilo per day is most desirably employed in order to achieve effective results.

In addition, the agent may be employed topically. For topical application they may be formulated in the form of solutions, creams, or lotions in pharmaceutically acceptable vehicles containing 0.1-5 percent, preferably 2 percent, of the agent and may be administered topically to the infected area of the skin.

Also the antibacterial properties of the compounds of this invention may be utilized for washing equipment in hospitals, homes and farms, instruments used in medicine and bacteriology, clothing used in bacteriological laboratories, and floors, walls and ceiling in rooms in which a background free of gram-positive and gram-negative microorganisms, such as those listed above, is desired. When employed in this manner the compounds of this invention may be formulated in a number of compositions comprising the active compound and an inert material. In such compositions, while the compounds of formula I of this invention may be employed in concentrations as low as 500 p.p.m., from a practical point of view, it is desirable to use from about 0.10% by weight, to about 5% by weight or more.

The formulations that may be used to prepare antiseptic wash solutions of the compounds of this invention are varied and may readily be accomplished by standard techniques, see for example, "Remington's Practice of Pharmacy", E. W. Martin et al., Eds., 12th ed., Mack Publishing Company, Easton, Penn., 1961, pp. 1121 - 1150. In general, the compounds may be made up in stock solutions. They can also be formulated as suspensions in an aqueous vehicle. These make useful mixtures for decontaminating premises. Also, aqueous vehicles containing emulsifying agents, such as sodium lauryl sulfate, and relatively high concentrations, e.g., up to about 5% by weight, of the compounds may be formulated by conventional techniques.

A typical antiseptic preparation useful for disinfecting floors, walls, ceiling, and articles in a contaminated room may be prepared by adding 5 to 25 g. of N,N,1-trimethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetamide to a mixture of 150 to 300 g. of polyethylene glycol 1540 and 150 to 300 g. of polyethylene glyol 300. The resulting mixture is stirred while a solution of 1 to 10 g. of sodium lauryl sulfate in 300 to 400 ml. of water is added portionwise. The article to be disinfected is coated or immersed in the preparation for a prolonged time, for example, one hour, and then rinsed with sterile water.

Preparation of Indole Derivatives

For the preparation of the indole derivatives of this invention we prefer to use as starting materials the compounds of the general formula II. ##STR6## in which R², R³, R⁴, R⁵ , R⁶ and R⁷ are as defined in the first instance and X' is hydroxy or mercapto.

The starting materials of formula II in which X' is hydroxy are either known, for example, tryptophol, described by H. R. Snyder and F. J. Pilgrim, J. Am. Chem. Soc. 70, 3770 (1948), or they may be obtained by the following process: ##STR7##

With reference to this process phenylhydrazines of formula III and the hydroxyaldehyde of formula IV are reacted together according to the conditions of the "Fischer Indole Synthesis", for example, see P. L. Julian, E. N. Myer and H. C. Printy, "Heterocylic Compounds", R. C. Elderfield, Ed., Vol. 3, John Wiley and Sons, Inc., New York, 1952, pp. 8 - 11, to form the desired starting material (II, X' = OH).

The phenylhydrazines of formula III are either known or may be prepared according to known methods. A convenient method involves the diazotization of the appropriately substituted aniline to give the corresponding diazo derivative. The latter compound is then reduced with stannous chloride or sodium sulfite to give the corresponding phenylhydrazine, see L. F. Fieser and M. Fieser, "Advanced Organic Chemistry", Reinhold Publishing Corporation, New York, 1961, p. 734.

The hydroxyaldehydes of formula IV are either known, see for example, "Rodd's Chemistry of Carbon Compounds," S. Coffey, Ed., Vol. I d, 2nd ed., Elsevier Publising Co., Amsterdam, 1965, pp. 44 - 49, or they may be prepared according to known methods. A convenient method involves reduction of an appropriate lactone of formula ##STR8## with bis-(3-methyl-2-butyl)borane, H. C. Brown and D. B. Bigley J. Am. Chem. Soc., 83, 486 (1961), diisobutyl aluminum hydride, L. I. Zakharkkin and I. M. Khorlina, Tetrahedron Letters, 619 (1962) or sodium aluminum hydride, L. I. Zakharkin et al., Tetrahedron Letters, 2087 (1963). The appropriate lactones utilized in this reduction are either commercially available, for example, δ-valerolactone, α-methyl-butyrolactone, or they are described with a variety of methods for their preparation in organic chemistry textbooks; such as the textbooks, "Methoden der Organischen Chemie", Houben-Weyl, E. Muller, Ed., Vol. VI/2, Georg Thieme Verlag, Stuttgart, 1963, pp. 561- 852 or L. F. Fieser and M. Fieser, "Advanced Organic Chemistry", cited above.

Alternatively, the starting materials of formula II in which R², R³, R⁴ and R⁷ are hydrogen and X' is hydroxy may be prepared by lithium aluminum hydride reduction, N. G. Gaylord, "Reduction with Complex Metal Hydrides", Interscience Publishers, Inc., New York, 1956, pp. 332 - 370, of compounds of formula V described by T.-Y. Shen, U.S. Pat. No. 3,161,654, Dec. 15, 1964: ##STR9## wherein R¹⁵ is lower alkyl and R⁵ and R⁶ are as defined in the first instance.

The starting materials of formula II in which X' is mercapto and R², R³, R⁴, R⁵, R⁶, and R⁷ are as defined in the first instance may be obtained by the following process: The appropriate compound of formula II (X' = OH), described above, is treated with phosphorus tribromide in an inert solvent, for example, ether or carbon tetrachloride, to afford the corresponding 3-(2-bromoethyl)-indole derivative. The latter compound is then converted to the desired starting material of formula II (X' = SH) by a procedure similar to that described by N. N. Suvorov and V. N. Buyanov, Khim.-Farm. Zh., 1, 4 (1967), [Chem. Abstr. 67, 73474a (1967)], for converting 3-(2-bromoethyl)-indole to indole-3-ethanethiol (II; R², R³, R⁴, R⁵, R⁶ and R⁷ = H and X' = SH). Accordingly, the appropriate 3-(2-bromoethyl)-indole derivative is treated with sodium or potassium thiosulfate to afford the corresponding sodium or potassium β-(3-indolyl)ethyl thiosulfate derivative, respectively, which on treatment with strong alkali for example, sodium or potassium hydroxide, is transformed into the corresponding bis-[ω-(3-indolyl)ethyl]disulfide derivative. Reduction of the latter compound with lithium aluminum hydride gives the desired compounds of formula II.

It should be noted that the preceding process is not entirely practical for the preparation of the compounds of formula II in which X' is mercapto and R⁶ is hydroxy or lower alkanoyloxy. For this reason, the preferred starting materials of formula II for the ultimate preparation of the compounds of formula I in which R⁶ is hydroxy or lower alkanoyloxy and X is thio are the corresponding compounds of formula II in which R⁶ is benzyloxy, readily prepared by this process. When the latter compounds are used as starting materials in this manner, they are first subjected to the process (II + VI→VII), described below. Subsequently, the benzyloxy group is removed by hydrogenation, in the presence of a catalyst, for example, 10% palladium on carbon, to afford the corresponding compound of formula I in which R⁶ is hydroxy. The latter may be converted if desired to the corresponding compound of formula I in which R⁶ is lower alkanoyloxy by conventional means, for example, by treatment with the appropriate lower alkanoic anhydride preferably in the presence of pyridine. Likewise, it should be noted that similar use of the starting materials of formula II in which X' is hydroxy and R⁶ is benzyloxy to obtain the corresponding compound of formula I in which R⁶ is hydroxy or lower alkanoyloxy is preferred.

For the preparation of the acid and ester compounds of this invention of formula I in which Z' is hydroxy or lower alkoxy and R¹, R², R³, R⁴, R⁵, R⁶, R⁷, X and Y are as defined in the first instance, we have found that the following, hitherto undisclosed process is both practical and convenient: ##STR10## in which R¹, R², R³, R⁴, R⁵, R⁶, R⁷, X, Y and Z are as defined in this instance, X' is hydroxy or mercapto and R¹⁶ is hydrogen or lower alkyl. (For convenience and clarity these particular acid and ester compounds of formula I are represented above as formula VII).

With reference to the above scheme the starting material of formula II is condensed with a ketoacid (VI, R¹⁶ = H) or a ketoester (VI, R¹⁶ = lower alkyl) in the presence of a suitable acid catalyst to yield the compounds of formula VII.

Generally comparable yields of product are obtained in this process when either the ketoacid or the corresponding ketoester is used. However, in the case where it is desired to prepare acid compounds of formula VII in which Y is ##STR11## and R¹⁶ is hydrogen, it is preferable with respect to yield to first condense the appropriate β-ketoester of formula VI rather than the corresponding β-ketoacid and then hydrolyze the resulting ester product to give the desired acid compound.

Moreover, in the general practice of this invention it is often more convenient to prepare the acid compounds of formula VII by using the ketoester instead of the ketoacid in this process and then hydrolyze the resulting ester product to the desired acid, the reason being simply that the ketoesters are generally more readily available either commercially or by synthesis.

The hydrolysis of compounds of formula VII in which R¹⁶ is lower alkyl to their corresponding acids of formula VII is readily effected by treatment with a suitable alkali, for example, potassium hydroxide or sodium carbonate, in aqueous methanol or aqueous ethanol.

In practising the condensation (II + VI→VII) we have found it preferable to use a solvent as a reaction medium. Any solvent inert to the reaction conditions may be used. Suitable solvents include benzene, toluene, diethyl ether, dioxan, tetrahydrofuran, methylene dichloride, carbon tetrachloride and the like. Benzene and tetrahydrofuran are especially convenient and practical for this use. A variety of suitable acid catalysts may be used for this condensation, for example, the type of catalyst used in a Friedel-Crafts Reaction, i.e. p-toluenesulfonic acid, phosphorus pentoxide, boron trifluoride, zinc chloride, hydrochloric acid and sulfuric acid and the like. p-Toluenesulfonic acid, boron trifluoride and phosphorus pentoxide are included among the preferred acid catalysts. The amount of acid catalyst used is not especially critical and may range from 0.01 molar equivalents to 100 molar equivalents; however, a range of from 0.1 to 10 molar equivalents is generally preferred. The time of the reaction may range from 10 minutes to 60 hours, with the preferred range being from one-half to 24 hours. The temperature of the reaction may range from -20° C. to the boiling point of the reaction mixture. Preferred temperature ranges include 20° to 120° C.

The α-, β-, γ- and δ- ketoacids and -ketoesters of formula VI are either known, for example, ethyl pyruvate, levulinic acid, ethyl α,α-dimethylacetoacetate, β,β-dimethyllevulic acid and benzoylacetic acid or they may be prepared by known methods described in general organic chemistry textbooks. For example, a comprehensive review on the properties and preparation of such α-, β-, γ- and δ- ketoacids and -ketoesters may be found in "Rodd's Chemistry of the Carbon Compounds", cited above, Vol. 1d, pp. 226 - 274.

Alternatively, the acid compounds of formula I in which Z is hydroxy and R¹, R², R³, R⁴, R⁵, R⁶, R⁷, X and Y are as defined in the first instance may be prepared by the following process: ##STR12## in which Y' is CH₂, C(R⁸)(R⁹)CH₂, C(R⁸) (R⁹)C(R¹⁰)(R¹¹)CH₂ or C(R⁸)R⁹)C(R¹⁰)(R¹¹)C(R¹²)(R¹³)CH₂, R¹⁷ is hydrogen or lower alkyl, Z is hydroxy and R¹, R², R³, R⁴, R⁵, R⁶, R⁷, X and Y are as defined in the first instance.

With reference to this alternative process a starting material of formula II is condensed with an acylated ketoalcohol (VIII) in the presence of a suitable acid catalyst according to the conditions described above for the condensation (II + VI→VII). The ketoalcohol lower alkyl esters are either known, for example, acetonyl acetate or 5-acetoxypentan-2-one, or may be prepared by known methods, for instance, see "Rodd's Chemistry of the Carbon Compounds", cited above, Vol. 1d, pp. 49 - 54. In this manner the condensation product of general formula IX is obtained. Hydrolysis of this product with an aqueous alcoholic solution of a suitable alkali, for example, sodium hydroxide in aqueous methanol, affords the corresponding primary alcohol X. The primary alcohol is then oxidized to the corresponding aldehyde of formula XI. Although a variety of methods are known for the oxidation of a primary alcohol to its corresponding aldehyde, see for example, "Rodd's Chemistry of the Carbon Compounds", cited above, Vol. 1c, pp. 4 - 10, we have found that the method of K. E. Pfitzner and J. G. Moffat, J. Am. Chem. Soc., 87, 5670 (1965) using N,N-dicyclohexylcarbodiimide and dimethyl sulfoxide in the presence of a suitable acid, for example, trifluoroacetic acid, to be both efficacious and convenient in this case. Subsequently the aldehyde XI may be converted to the desired acid compounds of formula I by a variety of oxidizing agents, including silver oxide, alkaline permanganate, hydrogen peroxide, peracids and the like. In this case we prefer to use silver oxide according to the method of M. Delepine and P. Bonnet, Compt. rend., 149,39 (1909).

The amide compound of this invention of formula I in which Z is amino, lower alkylamino, di(lower)alkylamino and phenylamino and R¹, R², R³, R⁴, R⁵, R⁶, R⁷, X and Y are as defined in the first instance, may be prepared from their corresponding acid compounds of formula I (compounds of formula VII in which R¹⁶ is hydrogen, described above) by treatment of the latter compounds with a lower alkyl chloroformate, preferably ethyl chloroformate, in the presence of triethylamine, affording the corresponding mixed anhydride, which is converted by treatment with the appropriate amine, such as ammonia, aniline or a suitable alkylamine or dialkylamine, to the desired amide compound of formula I.

Alternatively, these amides of formula I may be prepared from the corresponding esters of formula I (compounds of formulae VII, in which R¹⁶ is lower alkyl, described above) by treatment of the latter compounds with the appropriate amine according to known methods, for example, see A. L. J. Beckwith in "The Chemistry of Amides", J. Zalicky, Ed., Interscience Publishers, New York, 1970, pp. 96 - 105.

Again alternatively, the amide compounds of formula I in which Z is amino, lower alkylamino, di(lower)alkylamino, and phenylamino and R¹, R², R³, R⁴, R⁵, R⁶, R⁷, X and Y are as defined in the first instance, may be prepared by the condensation of an appropriate starting material of formula II with an appropriate α-, β-, γ- or δ-ketoamide in the presence of a suitable acid catalyst according to the conditions described above for the condensation (II + VI→VII). The ketoamides required for this condensation are either known, for example, pyruvamide or α,α-dimethylacetoacetamide, or they may be prepared by known methods, for instance, see "Rodd's Chemistry of the Carbon Compounds", cited above, Vol. 1d, pp. 226 - 274.

The alkylated acid and ester compounds of this invention of formula I in which R⁷ is lower alkyl or lower alkenyl and Z is hydroxy or lower alkoxy, are prepared readily from the above described, corresponding acid or ester compounds of formula I in which R⁷ is hydrogen. This conversion involving the N-alkylation of the indolic nitrogen is effected by treatment of the latter compounds with an appropriate lower alkyl or lower alkenyl halide in an inert solvent in the presence of an acid acceptor. Preferred conditions for effecting this conversion include the use of sodium hydride as an acid acceptor and tetrahydrofuran as the inert solvent.

The N-alkylated amide compounds of formula I in which R⁷ is lower alkyl or lower alkenyl and Z is amino, lower alkylamino, di(lower)alkylamino or phenylamino are preferably prepared by either treatment of the N-alkylated acid compounds of formula I, described above, with a lower alkyl chloroformate followed by treatment with the appropriate amine, or treatment of the N-alkylated ester compounds of formula I, described above, with an appropriate amine, in the manner described previously for the preparation of the amide compounds of formula I in which R⁷ is hydrogen.

Finally, it is the intention to cover all changes and modifications of the embodiment of the invention herein chosen for the purpose of disclosure which are within the scope and spirit of this invention. Such changes and modification include those variations which depend on well known interconversions of acids and esters or alternation of the order of N-alkylation in the processes disclosed herein.

For example, in preparing the N-alkylated acid, ester or amide compounds of formula I in which R⁷ is lower alkyl or lower alkenyl, the changing of the order of the N-alkylation step, as depicted in the embodiment of this invention, by the act of N-alkylation of the starting materials of formula II and subjecting the products thereof to treatment with an appropriate ketoacid or ketoester of formula VI or a ketoamide, according to the teaching of the present disclosure, would not depart from the spirit or scope of this invention.

Likewise, the preparation of the N-alkylated amide compounds of formula I in which R⁷ is lower alkyl or lower alkenyl and Z is di(lower)alkylamino by N-alkylation of the corresponding compounds of formula I in which R⁷ is hydrogen, is considered to be a process which would be functionally equivalent to the process embodied herein for the preparation of these compounds.

It will also be apparent to those skilled in the art that the processes taught herein for the preparation of the indole derivatives of formula I are applicable likewise to the preparation of the indole derivatives of formula Ia, described above. In the latter case, the appropriate starting material of formula IIa, see below, prepared analogously to the starting material of formula II, is utilized.

More specifically, the acid and ester compounds of formula Ia in which R^6a, R^6b, R^6c, R^6d and R⁷ are as defined in the first instance, Z is hydroxy or lower alkoxy, and R¹, R², R³, R⁴, R⁵, X and Y are as defined in the first instance, are readily prepared by the condensation (IIa+VI→VIIa), illustrated below, according to the conditions described previously for the condensation (II+VI→VII). ##STR13## in which R¹, R², R³, R⁴, R⁵, R^6a, R^6b, R^6c, R^6d, R⁷, X, Y and R¹⁶ are as defined in the first instance.

Likewise, the acid compounds of formula Ia in which R^6a, R^6b, R^6c, R^6d are as defined in the first instance, Z is hydroxy and R¹, R², R³, R⁴, R⁵, R⁷, X and Y are as defined in the first instance may be prepared by the following process: ##STR14## in which R¹, R², R³, R⁴, R⁵, X, Y, Y', R^6a, R^6b, R^6c, R^6d, R⁷, and R¹⁷ are as defined in the first instance according to the process disclosed above for the conversion {II+VIII→IX→X→XI→I (Z= OH)}. Subsquent transformation of the above acid and ester compounds of formula Ia to their corresponding N-alkylated and amide derivatives of formula Ia is effected in the same manner for the similar conversions of the acid ester compounds of formula I, described herein.

Alternatively, the amide derivatives of formula Ia are prepared by the condensation of an appropriate starting material of formula IIa with an appropriate α-, β-, γ- or δ-ketoamide in the presence of a suitable acid catalyst according to the conditions described previously for the condensation (II+VI→VII).

The following examples will illustrate further this invention.

EXAMPLE 3 1-METHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]INDOLE-1-ACETIC ACID (I; R¹ = CH₃, R², R³, R⁴, R⁵, R⁶ AND R⁷ = H, X = O, Y = CH₂ CO AND Z = OH)

Ethyl acetoacetate (23.4 g., 0.18 moles) is added to a solution of the starting material of formula II, tryptophol (10.0 g., 0.06 moles). in 200 ml. of benzene. After standing for 10 minutes, p-toluenesulfonic acid (1.3 g.) and about 5 g. of hydrated alkali-aluminum silicate (Molecular Sieves No. 4) are added. The mixture is subjected to reflux for thirty minutes, 600 mg. more of p-toluenesulfonic acid is added and refluxing continued for 21/2 hours. The molecular sieves are collected and the benzene solution washed successively with 5% sodium bicarbonate and water, dried over sodium sulfate, and evaporated under reduced pressure to dryness affording an oil. The oil is subjected to chromatography on silica gel. Elution with 5% ether in benzene yields the ester, 1-methyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid ethyl ester, as an oil, δ_max ^CHCl.spsb.3 1715 cm^-1.

Hydrolysis of this ester to the title compound is effected as follows: The ester is dissolved in 230 ml. of methanol. To this is added 10 g. of KOH in 30 ml. of H₂ O and the solution is allowed to stand at room temperature overnight. The methanol is evaporated, water added and the solution washed with benzene. The aqueous phase is acidified with 6N HCl, and extracted with benzene. This organic phase is washed with water, dried over sodium sulfate and evaporated to dryness to give an oil, which is crystallized from benzene containing a trace of petroleum ether to afford the title compound, m.p. 150°- 152° C.,δ_max ^CHCl.spsb.3 3325 and 1705 cm^-1.

An equivalent amount of methyl acetoacetate may replace ethyl acetoacetate in the procedure of this Example. In this case, 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-acetic acid methyl ester, m.p. 87°-90° C. after recrystallization from benzenehexane, is obtained as the ester.

An equivalent amount of propyl acetoacetate may replace ethyl acetoacetate in the procedure of this Example. In this case, 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid propyl ester is obtained as the ester.

EXAMPLE 2 1-METHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]INDOLE-1-PROPIONIC ACID (I; R¹ = CH₃, R², R³, R⁴, R⁵, R⁶ AND R⁷ = H, X = O, Y = CH₂ CH₂ CO AND Z = OH)

A mixture of the starting material of formula II, tryptophol (500 mg.) levulinic acid (580 mg.), 75 ml. of benzene, 1.7 g. of phosphorus pentoxide and about 0.5 g. of diatomaceous earth (Celite) is stirred magnetically at room temperature for 15 minutes and then at 70° C. for 11/2 hr. The reaction mixture is filtered. The filtrate is washed three times with 5N NaOH; the combined aqueous phase is washed twice with ether and then rendered acidic with cold 50% HCl. The aqueous phase is extracted with chloroform. The chloroform extract is dried (Na₂ SO₄) and evaporated to dryness. The residue is crystallized from ethyl acetate-petroleum ether to afford the title compound, m.p. 104°-110° C., nmr (CDCl₃) δ1.47 (3H), 2.18 (4H), 2.74 (2H), 3.96 (2H), 7.18 (4H), 7.85 (1H), 9.60 (1.H).

The above title compound is also obtained by following the procedure of Example 1 but replacing ethyl acetoacetate with an equivalent amount of ethyl levulinate. In this case 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-propionic acid ethyl ester, m.p. 116°-118° C., δ_max ^CHCl.spsb.3 1716 cm^-1, after crystallization from benzene-petroleum ether, is obtained as the ester prior to hydrolysis.

EXAMPLE 3 1-METHYL-1,3,4,9-TETRAHYDROTHIOPYRANO[3,4-b]INDOLE-1-ACETIC ACID (I; R¹ = CH₃, R², R³, R⁴, R⁵, R⁶ AND R⁷ = H, X = S, Y = CH₂ CO AND Z = OH)

Indole-3-ethanethiol (1.5 g.) and methyl acetoacetate are mixed with 50 ml. of benzene and the solution heated for 30 min. (bath temperature 70°-80° C.). p-Toluenesulfonic acid (0.15 g.) is added and the reaction mixture is subjected to reflux and stirring for 12 hours. Water formed in the reaction mixture during this period is collected by a water separator. After cooling the benzene solution is washed with a 10% solution of sodium bicarbonate, water, saturated brine and dried over sodium sulfate. Evaporation of the benzene solution yields the ester, 1-methyl-1,3,4,9-tetrahydrothiopyrano[3,4-b]indole-1-acetic acid methyl ester as a semi-solid, δ_max ^CHCl.spsb.3 1715 cm^-1.

This ester is then treated with aqueous alcoholic KOH in the manner described for the esters in Example 1 and 2 to afford the title compound, m.p. 147°-149° C., nmr (CDCl₃) δ1.86 (S, 3H), 3.06 and 8.12 (6H), 7.35 (multiplet, 4H), 8.71 (1H), 10.31 (1H), after recrystallization from benzene-hexane.

The procedures of Examples 1, or 3 may be followed to prepare other compounds of formula I in which R¹, R², R³, R⁴, R⁵, R⁶, X and Y are as defined in the first instance, R⁷ is hydrogen and Z is hydroxy. Examples of such compounds of formula I are listed Tables I and II. In each of these examples an equivalent amount of the starting material of formula II listed therein is used instead of the starting material of formula II described in the procedures of Examples 1 and 3. Note that in each of these examples the ester obtained prior to hydrolysis is the corresponding ester compound of formula I in which Z is a lower alkoxy of the product listed therein, the alkyl portion of said lower alkoxy being derived from the R¹⁶ portion of the ketoester of formula VI employed therein.

Similarly, the procedure of Example 2 may be used to prepare the products listed in Tables I and II. In this case an equivalent amount of the starting material of formula II, listed therein is used instead of the starting material of formula II described in Example 2 and an equivalent amount of the corresponding ketoacid of formula VI of the ketoester of formula VI listed therein is used instead of the said ketoester.

TABLE I
        KETOESTER OF PRODUCT:[(PREFIX   FORMULA VI LISTED BELOW)-1,3,4,9
 EX- FORMULA IISTARTING MATERIAL OF
  ##STR15##
  (SUFFIX LISTED BELOW)][3,4-b]INDOLE-1-TETRAHYDROPYRANO
   AMPLE R.sup.2 R.sup.4 R.sup.4 R.sup.6 R.sup.6 X R.sup.1 Y R.sup.16
 PREFIX//SUFFIX
   4 H H H H H O CH.sub.3 CO C.sub.2 H.sub.5 1-methyl//carboxylic
   acid 5 CH.sub.3 H H H H O C.sub.2 H.sub.5 CO C.sub.2
  H.sub.5 1-ethyl-3-methyl//           carboxylic acid 6 n-C.sub.3
 H.sub.7 H H H 5-CH.sub.3 O n-C.sub.3
  H.sub.7 CO CH.sub.3 1,3-diisopropyl-6-           methyl//carboxylic
       acid 7 CH.sub.3 CH.sub.3 H H 5-OH O CH.sub.3 CHCH CO CH.sub.3
 3,3-dimethyl-6-hydroxy           1-(1-propenyl)//           carboxylic
 acid 8 H H HH 7-C.sub.2 H.sub.5 O HCC CO CH.sub.3 8-ethyl-1-ethynyl//
        carboxylic acid 9 H H 2-C.sub.3
  H.sub.7 H H O
 ##STR16##
  CO CH.sub.3 1-cyclopropyl-4-isopropyl//carboxylic acid 10 CH.sub.3
 CH.sub.3 C.sub.2 H.sub.5C.sub.2
  H.sub.5 H O
 ##STR17##
  CO CH.sub.3 1-cyclopentyl-4,4-diethyl-3,3-dimethyl//carboxylic acid 11
 H H H H H O
  ##STR18##
  CO CH.sub.3 1-phenyl//carboxylicacid 12 CH.sub.3 C.sub.2 H.sub.5 H H H
 O
  ##STR19##
  CO CH.sub.3 1-benzyl-3-ethyl-3-methyl//carboxylicacid 13 H H H H 6-Cl O
  ##STR20##
  CO  7-chloro-1-(2-thienyl)//carboxylicacid 14 HH CH.sub.3 H H O
 CH.sub.3 CH.sub.2 CO C.sub. 2 H.sub.5 1,4-dimethyl//acetic
 acid m.p. 163 - 164° C. 15 H H H H H O C.sub.2 H.sub.5 CH.sub.2
 CO C.sub.2 H.sub.5 1-ethyl//acetic acid,           m.p. 137 -
  140° C. 16 H H H H H O n-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2
 H.sub.5 1-propyl//acetic acid           m.p. 148 - 151°
  C.             PRODUCT:[(PREFIX    LISTED BELOW)-1,3,4,9-   KETOESTER
 OF TETRAHYDROPYRANO- EX- STARTING MATERIAL OF FORMULA VI [3,4-b]INDOLE-1-
  AMPLE FORMULA II (R.sup.1COYOR.sup.16) (SUFFIX LISTED BELOW)]  R.sup.2
 R.sup.3 R.sup.4 R.sup.5 R.sup.6 X R.sup.1 Y R.sup.16 PREFIX//SUFFIX
   17 H H H H H O i-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2
  H.sub.5 1-isopropyl//acetic           acid, m.p. 150 - 152° C.
 18 CH.sub.3 H H H H O CH.sub.2CHCH.sub.2 CH.sub.2 CO C.sub.2 H.sub.5
 1-allyl-3-methyl//           acetic acid 19 CH.sub.3 H H H H O n-C.sub.3
 H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 3-methyl-1-propyl//           acetic
 acid;           m.p. 75 - 80° C.           (Isomer A), m.p. 146 -
           148° C (Isomer B). 20 CH.sub.3 H C.sub.2 H.sub.5
 CH.sub.3 H O HCC CH.sub.2 CO C.sub.2 H.sub.5 4-ethyl-1-ethynl-3-
   methyl//acetic acid,           ν.sub.max.sup.CHCl 3 3300,2135,1710
 c.sup.-m 21 H H H H H O CH.sub.3 CH(CH).sub.3 CO C.sub.2 H.sub.5
 α,1-dimethyl//acetic           acid; m.p. 154 - 156° C.
       (Isomer A), m.p. 163 -           165°0 C. (Isomer B). 22 H
 H H H H O
  ##STR21##
  C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-cyclohexyl-α,α-dimethyl//acetic acid 23 H H H H H
 O
  ##STR22##
  CH.sub.2 CO C.sub.2 H.sub.5 1-phenyl//acetic acid,m.p. 148 -150°
 C. 24 H H H H H O t-C.sub.4 H.sub.9 CH.sub.2 CO C.sub.2
  H.sub.5 1-t-butyl//acetic acid,           m.p. 210 - 212° C. 25
 H H H H H O n-C.sub.4 H.sub.9 CH.sub.2 CO C.sub.2
  H.sub.5 1-butyl//acetic acid           m.p. 124 - 127° C. 26 H H
 H H 7-CH.sub.3 O n-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2
  H.sub. 5 8-methyl-1-propyl//           acetic acid m.p.127 -
 128 °
  C. 27 H H H H H O
 ##STR23##
  CH.sub.2 CO C.sub.2 H.sub.5 1-(2-thienyl)//aceticacid m.p. 127 -
 130° C. 28 H H H H 5-Br O C.sub.2 H.sub.5 CH.sub.2 CO C.sub.2
 H.sub.5 6-bromo-l-ethyl//acetic           acid m.p. 182 - 184° C.
 29 H H H H 5-OCH.sub.3 O CH.sub.3 CH.sub.2
  CO CH.sub.3 6-methoxy-l-methyl//           acetic acid, m.p.
 142 - 143 ° C. 30 H H H H 5-OCOCH.sub.3 O CH.sub.3CH.sub.2 CO
 C.sub.2 H.sub.5 6-acetoxy-l-methyl//           acetic acid, m.p.
   142 - 143° C. 31 H H H H 5-tenzyl- O CH.sub. 3 CH.sub.2 CO
 C.sub.2 H.sub.5 6-benzyloxy-l-methyl/      oxy     acetic acid, m.p.
       163.5 ° C. 32 H H H H 4-CH.sub.3 O n-C.sub.3 H.sub.7
 CH.sub.2 CO C.sub.2 H.sub.5 5-methyl-l-propyl//           aceticacid,
 m.p.           177 -178° C. 33 H H H H 6-CH.sub.3 O n-C.sub.3
 H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 7-methyl-l-propyl//           acetic
 acid, m.p.           157 - 158° C. 34 H H H H 5-NO.sub.2 O
 n-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 6-nitro-l-propyl//
   acetic acid, m.p.           119 - 120° C. 35 i-C.sub.3 H.sub.7
 H i-C.sub.3 H.sub.7 H 5-NO.sub.2 O CHCH CH(CH.sub.3  )00 C.sub.2 H.sub.5
 3,4-diisopropyl-α-           methyl-6-nitro-l-           vinyl//ace
 tic acid  36 H H CH.sub.3 CH.sub.3 H O n-C.sub.3 H.sub.7 CH.sub.2 CO
 C.sub.2 H.sub.5 4,4-dimethyl-1-           propyl//acetic acid, m.p. 184
 - 185°C. 37 H H C.sub.2 H.sub.5 H 7-CH.sub.3 O HCC C(i-C.sub.3
 H.sub.7).sub.2 CO C.sub.2 H.sub.5 α,α-diisopropyl-4-
   ethyl-l-ethynyl-8-           methyl//acetic acid 38 CH.sub.3 CH.sub.3
 H H 5-OC.sub.2
  H.sub.5 O
 ##STR24##
  CH(C.sub.2 H.sub.7).sub.2 CO C.sub.2
  H.sub.5 l-cyclopropyl-α,α-diethyl-3,5-dimethyl-6-ethoxy//ace
 tic acid 39 CH.sub.3 CH.sub.3 C.sub.2 H.sub.5 C.sub.2 H.sub.5 6-O.sub.2
 H.sub.5 O
  ##STR25##
  C(CH.sub.3).sub.2 OO C.sub.2 H.sub.5 l-cyclohexyl-α,α       t
 ,3,3,-etramethyl-4,4,7-triethyl//acetic acid 40 CH.sub.3 H n-C.sub.3
 H.sub.7 n-C.sub.3 H.sub.7 4-N-C.sub.3
  H.sub.7 O
 ##STR26##
  CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,3-dimethyl-l-phenyl4,4,5-tripropyl//acetic acid  41 H H
 H H H O
  ##STR27##
  C(CH.sub.3).sub.2 CO C.sub.2                                            a
  H.sub.5 α,α-dimethyl-1-phenyl//cetic acid 42 C.sub.2
 H.sub.5 C.sub.2 H.sub.5 C.sub.2 H.sub.5 C.sub.2 H.sub.5 4-C.sub.2
 H.sub.5 O
  ##STR28##
  C(i-C.sub.3 H.sub.7).sub.2 CO C.sub.2
  H.sub.5 1-benzyl-α,α-diisopropyl-3,3,4,4,5pentaethyl//acetica
 cid 43 CH.sub.3 H H H
  ##STR29##
  O
  ##STR30##
  C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-benzyl-8-propionoxyα,α,3-trimethyl//acetic acid
 44 H H CH.sub.3 H H O
  ##STR31##
  CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,4-dimethyl-1-(2-thienyl)//aceticacid 45 H H H H H O
  ##STR32##
  C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 α,α-dimethyl-1-(2-thienyl)//aceticacid 46 H H H H
 4-I O i-C.sub.3 H.sub.7 CH.sub.2 CH.sub.2 CO C.sub.2
  H.sub.5 5-iodo-1-isopropyl//           propionic acid 47 CH.sub.3
 CH.sub.3 CH.sub.3 CH.sub.3
  ##STR33##
  O CH.sub.2CH CH.sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 8-acetoxy-α,3,3,4,4-pentamethyl-1-vinyl//propionic acid
 48 H H H H 6-OH O HCCCH.sub.2 C(C.sub.2 H.sub.5).sub.2 CH.sub.2 CO
 C.sub.2
  H.sub.5 β,β-diethyl-7-hydroxy-           1-(2-propynyl)//
       propionic acid 49 CH.sub.3 H H H 7-NO.sub.2 O
  ##STR34##
  CH.sub.2 CH(n-C.sub.3 H.sub.7)CO C.sub.2
  H.sub.5 1-cyclobutyl-3-methyl-8-nitro-α-propyl//propionic acid 50
 H H CH.sub.3 H 5-CH.sub.3 O
  ##STR35##
  C(CH.sub.3).sub.2 C(CH.sub.3 ).sub.2 CO C.sub.2
  H.sub.5 α,α,β,β,4,6-hexamethyl1-phenyl//propionica
 cid 51 i-C.sub.3
  H.sub.7 H H H 7-Br O
 ##STR36##
  CH(CH.sub.3)CH(C.sub.2 H.sub.5)CO C.sub.2
  H.sub.5 1-benzyl-8-bromo-α-ethyl-3-isopropyl-β-methyl//propio
 nicacid 52 C.sub.2 H.sub.5 H C.sub.2
  H.sub.5 H 7-Cl O
 ##STR37##
  CH.sub.2 CH.sub.2 CH.sub.2 CO C.sub.2
  H.sub.5 8-chloro-3,4-diethyl-1-(2-thienyl)//propionic acid 53 CH.sub.3
 H H H H O CH.sub.3 CH.sub.2 C(n-C.sub.3 H.sub.7).sub.2 CO C.sub.2
 H.sub.5 1,3-dimethyl-α,α-           dipropyl//propionic
      acid 54 CH.sub.3 H C.sub.2 H.sub.5 C.sub.2
  H.sub.5 H O
 ##STR38##
  CH(CH.sub.3)C(CH.sub.3).sub.2
  CO CH.sub.3
 ##STR39##
  55 H H CH.sub.3 CH.sub.3 H O HCC C(CH.sub.3).sub.2 CH.sub.2 CO CH.sub.3
 1-ethynyl-β,β,4,4-           tetramethyl//propionic
 acid 56 H H n-C.sub.3
  H.sub.7 H
 ##STR40##
  O
  ##STR41##
  C(C.sub.2 H.sub.5).sub.2 C(C.sub.2
  H.sub.5)CO CH.sub.3 1-cyclopentyl-5-propionoxy-4-propyl-α,β,.
 beta.-triethyl//propionic acid 57 n-C.sub.3 H.sub.7 H H H 4-OCH.sub.3 O
  ##STR42##
  CH.sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 5-methoxy-α-methyl-1-phenyl-3-propyl//propionic acid 58 H
 H i-C.sub.3
  H.sub.7 H 6-benzyloxy O
 ##STR43##
  CH.sub.2 CH(C.sub.2 H.sub.5)CO C.sub.2
  H.sub.5 1-benzyl-7-benzyloxy-α-ethyl-4-isopropyl//propionic acid
 59 CH.sub.3 CH.sub.3 CH.sub.3 CH.sub.3 7-Cl O
  ##STR44##
  CH(CH.sub.3)CH.sub.2 CO C.sub.2
  H.sub.5
 ##STR45##
  60 C.sub.2 H.sub.5 H H H 5-NO.sub.2 O CH.sub.3 CH(C.sub.2
  H.sub.5).sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5 1-methyl-6-nitro-α,α,-           β,β,3-pen
 taethyl//           propionic acid 61 C.sub.2 H.sub.5 C.sub.2 H.sub.5 H
 H 5-F O CH.sub.2CHCH.sub.2 CH(C.sub.2 H.sub.5)CH(CH.sub.3)CO C.sub.2
 H.sub.5 1-allyl-6-fluoro-α-           methyl-β,3,3-triethyl//
           propionic acid 62 C.sub.2 H.sub.5 C.sub.2
  H.sub.5 H H 4-C.sub.2 H.sub.5 O CH.sub.3 CCH C(n-C.sub.3
  H.sub.7)CH.sub.2
  CO CH.sub.3 β                                     propyl-1-(1-
       propynyl)-3,3,5-           triethyl//propionic           acid 63 H
 H H H 6-OC.sub.2
  H.sub.5 O
 ##STR46##
   CH(C.sub.2 H.sub.5)CH(C.sub.2 H.sub.5)CO C.sub.2
  H.sub.5 1-cyclopropyl-α,β-diethyl-6-ethoxy//propionic acid
 64 CH.sub.3 CH.sub.3 CH.sub.3 CH.sub.3 6-On-C.sub.3
  H.sub.7 O
 ##STR47##
  C(CH.sub.3).sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,β,β,3,3,4,4-heptamethyl-1-phenyl-7-propoxy//pr
 opionicacid 65 C.sub.2 H.sub.5 C.sub.2
  H.sub.5 H H 5-CH.sub.3 O
 ##STR48##
  C(CH.sub.3).sub.2 C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-benzyl-3,3-diethyl-α,α,β,β,6-pentamethyl
 //propionic acid 66 n-C.sub.3
  H.sub.7 H H H 4-OH O
 ##STR49##
  C(CH.sub.3).sub.2 C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 5-hydroxy-3-propyl-α,α,β,β-tetramethyl-1-(
 2-thienyl)//propionic acid 67 H H H H H O CH.sub.3 CH.sub.2 CH.sub.2
 CH.sub.2 CO C.sub.2 H.sub.5 1-methyl//butyric           acid, m.p. 132 -
 135° C 68 CH.sub.3 H H H H O C.sub.2 H.sub.5 CH(CH.sub.3)CH.sub.2
 CH.sub.2 CO C.sub.2 H.sub.5 γ,3-dimethyl-1-ethyl//
 butyric acid 69 CH.sub.3 CH.sub.3 H H H O n-C.sub.3 H.sub.7 C(C.sub.2
 H.sub.5).sub.2 CH.sub.2 CH.sub.2 CO C.sub.2
  H.sub.5 γ,γ-diethyl-3,3-           dimethyl-1-propyl//
      butyric acid 70 CH.sub.3 CH.sub.3 n-C.sub.3
  H.sub.7 H H O CH.sub.2CH C(n-C.sub.3 H.sub.7).sub.2 CH(n-C.sub.3
 H.sub.7)CH.sub.2 CO C.sub.2
  H.sub.5 3,3-dimethyl-β,γ,γ,4-           tetrapropyl-1-v
 inyl//           butyric acid 71 H H H H H O CH.sub.2CHCH.sub.2 [C(CH.sub
 .3).sub.2 ].sub.2 CH.sub.2 CO C.sub.2
  H.sub.5 1-allyl-β,β,γ,γ-           tetramethyl//bu
 tyric           acid 72 H H C.sub.2 H.sub.5 C.sub.2 H.sub.5 6-Cl O
 CH.sub.2CH [C(C.sub.2 H.sub.5).sub.2 ].sub.2 CH(C.sub.2 H.sub.5)CO
 C.sub.2 H.sub.5 7-chloro-α,β,β,γ,γ,4,-
     4-heptaethyl-1-vinyl//           butryic acid 73 H H CH.sub.3 H
 4-CH.sub.3 O HCCH [C(CH.sub.3).sub.2 ].sub.3 CO C.sub.2
  H.sub.5 1-ethynyl-α,α,β,β,γ,γ,
    4,5-octamethyl//           butyric acid 74 C.sub.2 H.sub.5 C.sub.2
 H.sub.5 C.sub.2
  H.sub.5 H
 ##STR50##
  O CH.sub.3 CCH CH(C.sub.2 H.sub.5)[C(C.sub.2 H.sub.5)].sub.2 CO C.sub.2
 H.sub.5
  ##STR51##
  75 H H CH.sub.3 CH.sub.3 7-OCH.sub.3 O
  ##STR52##
  CH.sub.2 [C(CH.sub. 3).sub.2 ].sub.2 CO C.sub.2
  H.sub.5 1-cyclobutyl-α,α,β,β,-4,4-hexamethyl-8-met
 hoxy//butyric acid 76 H H H H 4-Br O
  ##STR53##
  CH.sub.2 CH(CH.sub.3)C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 5-bromo-1-cyclopentyl-α,α,β-trimethyl//butyric
 acid 77 CH.sub.3 CH.sub.3 H H 4-n-C.sub.3
  H.sub.7 O
 ##STR54##
  CH.sub.2 CH.sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5
 ##STR55##
  78 H H H H 7-C.sub.2
  H.sub.5 O
 ##STR56##
  CH.sub.2 CH.sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5
 ##STR57##
  79 CH.sub.3 CH.sub.3 CH.sub.3 H 5-F O
  ##STR58##
  [CH(CH.sub.3)].sub.3 CO C.sub.2
  H.sub.5
 ##STR59##
  80 CH.sub.3 CH.sub.3 H H 4-CH.sub.3 O
  ##STR60##
  CH(C.sub.2 H.sub.5)CH.sub.2 CH(C.sub.2 H.sub.5)CO C.sub.2 H.sub.5
  ##STR61##
  81 C.sub.2
  H.sub.5 H H H 6-NO.sub.2 O
 ##STR62##
  [CH(CH.sub.3)].sub.3 CO C.sub.2
  H.sub.5 1-benzyl-3-ethyl-7-nitro-α,β,γ-trimethyl//butyr
 icacid 82 CH.sub.3 CH.sub.3 H H 4-n-C.sub.3
  H.sub.7 O
 ##STR63##
  CH.sub.2 [CH(C.sub.2 H.sub.5)].sub.2 CO C.sub.2
  H.sub.5 1-benzyl-α,β-diethyl-3,3-dimethyl-5-propyl//butyric
 acid 83 H H H H 7-OH O
  ##STR64##
  C(CH.sub.3).sub.2 CH.sub.2 C(CH.sub.3).sub.2 CO C.sub.2 H.sub.5
 1-benzyl-8-hydroxy-α,α,γ,γ-tetramethyl//butyric
 acid 84 CH.sub.3 H CH.sub.3 H 4-OC.sub.2
  H.sub.5 O
 ##STR65##
  [C(CH.sub.3).sub.2 ].sub.3 CO C.sub.2
  H.sub.5 5-ethoxy-α,α,β,β,γ,γ,-3,4-octo
 methyl-1-(2-thienyl)//butyric acid 85 C.sub.2 H.sub.5 H C.sub.2 H.sub.5
 C.sub.2 H.sub.5 6-Cl O
  ##STR66##
  CH.sub.2 CH.sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5 7-chloro-α,α,3,4,4-pentaethyl-1-(2-thienyl)//butyric
  acid 86 CH.sub.3 CH.sub.3 CH.sub.3 CH.sub.3 4-Br O
  ##STR67##
  CH.sub.2 CH.sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 5-bromo-α,3,3,4,4-pentamethyl-1-(2-thienyl)//butyric
 acid

TABLE 2
    KETOESTER OF PRODUCT: [(PREFIX   FORMULA VI LISTED BELOW)-1,3,4,9-
 EX- FORMULA IISTARTING MATERIAL OF
  ##STR68##
  (SUFFIX LISTED BELOW)[3,4-b]INDOLE-1- AMPLE R.sup.2 R.sup.3 R.sup.4
 R.sup.5 R.sup.6 X R.sup.1 Y R.sup.16 PREFIX//SUFFIX
   87 H H H H S CH.sub.3 CO C.sub.2 H.sub.5 1-methyl//carboxylic
  acid 88 CH.sub.3 H H H H S C.sub.2 H.sub.5 CO C.sub.2
  H.sub.51-ethyl-3-methyl//           carboxylic acid 89 i-C.sub.3
 H.sub.7 H H H 5-CH.sub.3 S i-C.sub.3
  H.sub.7 CO CH.sub.3 1,3-diisopropyl-6-           methyl//carboxylic
       acid 90 CH.sub.3 CH.sub.3 H H 5-OH S CH.sub.3 CHCHCO CH.sub.3
 3,3-dimethyl-6-           hydroxy-1-81-propenyl)//           carboxylic
 acid 91 H H H H 7-C.sub.2 H.sub.5 S HCC CO CH.sub.3 8-ethyl-1-ethynyl//
          carboxylic acid 92 H H i-C.sub.3
  H.sub.7 H H S
 ##STR69##
  CO CH.sub.3 1-cyclopropyl-4-iso-propyl//carboxylicacid 93 CH.sub.3
 CH.sub.3 C.sub.2 H.sub.5 C.sub.2
  H.sub.5 H S
 ##STR70##
  CO CH.sub.3 1-cyclopentyl-4,4-diethyl-3,3-dimethyl//carboxylic acid 94
 H H H H H S
  ##STR71##
  CO CH.sub.3 1-phenyl//carboxylicacid 95 CH.sub.3 C.sub.2 H.sub.5 H H H
 S
  ##STR72##
  CO CH.sub.3 1-benzyl-3-ethyl-3-methyl//carboxylicacid 96 H H H H 6-Cl S
  ##STR73##
  CO  7-chloro-1-(2-thienyl)//carboxylic acid 97 H H CH.sub.3 H H S
 CH.sub. 3 CH.sub.2 CO C.sub.2 H.sub.5 1,4-dimethyl//acetic
 acid 98 H H H H H S C.sub.2 H.sub.5 CH.sub.2 CO C.sub.2
  H.sub.5 1-ethyl//acetic acid,           m.p. 138° C. 99 H H H H
 H S n-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 1-propyl//acetic acid,
          m.p. 127-129° C. 100 H H H H H S i-C.sub.3 H.sub.7
 CH.sub.2 CO C.sub.2 H.sub.5 1-isopropyl//acetic           acid 101
 CH.sub.3 H H H H S CH.sub.2 =CHCH.sub.2 CH.sub.2 CO C.sub.2 H.sub.5
 1-allyl-3-methyl//           acetic acid 102 CH.sub.3 H H H H S n-C.sub.3
  H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 3-methyl-1-propyl//
 acetic acid 103 CH.sub.3 H C.sub.2 H.sub.5 CH.sub.3 H S HC C CH.sub.2 CO
 C.sub.2 H.sub.5 4-ethyl-1-ethynyl-           3-methyl//acetic
 acid 104 H H H H H S CH.sub.3 CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,1-dimethyl//acetic           acid 105 H H H H H S
  ##STR74##
  C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-cyclohexyl-α,α-dimethyl//aceticacid 106 H H H H H
 S
  ##STR75##
  CH.sub.2 CO C.sub.2 H.sub.5 1-phenyl//aceticacid 107 H H H H H S
 t-C.sub.4 H.sub.9 CH.sub.2 CO C.sub.2 H.sub.5 1-t-butyl//acetic
  acid 108 H H H H H S n-C.sub.4 H.sub.9 CH.sub.2 CO C.sub.2 H.sub.5
 1-butyl//acetic acid 109 H H H H 7-CH.sub.3 S n-C.sub.3 H.sub.7 CH.sub.2
 CO C.sub.2 H.sub.5 8-methyl-1-propyl//           acetic acid 110 H H H H
 H S
  ##STR76##
  CH.sub.2 CO C.sub.2 H.sub.5 1-(2-thienyl)//acetic acid 111 H H H H 5-Br
 S n-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 6-bromo-1-propyl//
     acetic acid 112 H H H H 5-och.sub.3 S CH.sub.3 CH.sub.2 CO CH.sub.3
 6-methoxy-1-methyl//           acetic acid 113 H H H H 5-COOCH.sub.3 S
 CH.sub.3 CH.sub.2 CO C.sub.2 H.sub.5 6-acetoxy-1-methyl//  acetic acid
 114 H H H H 5-benzyl- S CH.sub.3 CH.sub.2 CO C.sub.2
  H.sub.5 6-benzyloxy-1-  oxy  methyl//acetic acid 115 H H H H 4-CH.sub.3
 S n-C.sub.3 H.sub.7 CH.sub.2 CO C.sub.2 H.sub.5 5-methyl-1-propyl//
 acetic acid 116 H H H H 6-CH.sub.3 S n-C.sub.3 H.sub.7 CH.sub.2 CO
 C.sub.2 H.sub.5 7-methyl-1-propyl//  acetic acid 117 H H H H 7-F S
 CH.sub.2CH C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5 α,α-diethyl-8-  fluoro-1-vinyl//  acetic acid 118
 i-C.sub.3 H.sub.7 H i-C.sub.3
  H.sub.7 H 5-NO.sub.2S CH.sub.2CH CH)CH.sub.3)CO C.sub.2 H.sub.5
 3,4-diisopropyl-α-  methyl-6-nitro-  1-vinyl//acetic  acid 119
 CH.sub.3 CH.sub.3 H H 5-Cl S CH.sub.3 CC CH(i-C.sub.3 H.sub.7)CO C.sub.2
 H.sub.5 6-chloro-3,3-dimethyl  α
 isopropyl-1-  (1-propynyl)//acetic  acid 120 H H C.sub.2 H.sub.5 H
 7-CH.sub.3 S HCC C(i-C.sub.3 H.sub.7).sub.2 CO C.sub.2
  H.sub.5 α,α-diisopropyl-  4-ethyl-1-ethynyl-  8-methyl//acet
 ic  acid 121 CH.sub.3 CH.sub.3 H H 5-OC.sub.2
  H.sub.5 S
 ##STR77##
  CH(C.sub.2 H.sub.5)CO C.sub.2
  H.sub.5 1-cyclopropyl-α,α-diethyl-3,3-dimethyl-6-ethoxy//ace
 tic acid 122 CH.sub.3 CH.sub.3 C.sub.2 H.sub.5 C.sub.2 H.sub.5 6-C.sub.2
 H.sub.5 S
  ##STR78##
  C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-cyclohexyl-α,α,3,3-tetramethyl-4,4,7-triethyl//ace
 ticacid 123 CH.sub.3 H n-C.sub.3 H.sub.7 n-C.sub. 3 H.sub.7 4-n-C.sub.3
 H.sub.7 S
  ##STR79##
  CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,3-dimethyl-1-phenyl-4,4,5-tripropyl//acetic acid 124 H
 H H H H S
  ##STR80##
  C(CH.sub.3).sub.2 CO C.sub.2                                            a
  H.sub.5 α,α-dimethyl-1-phenyl//cetic acid 125 C.sub.2
 H.sub.5 C.sub.2 H.sub.5 C.sub.2 H.sub.5 C.sub.2 H.sub.5 4-C.sub.2
 H.sub.5 S
  ##STR81##
  C(i-C.sub.3 H.sub.7).sub.2 CO C.sub.2
  H.sub.5 1-benzyl-α,α-diisopropyl-3,3,4,4,5-pentaethyl//aceti
 cacid 126 CH.sub.3 H H H
  ##STR82##
  S
  ##STR83##
  C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-benzyl-8-propionoxy-α,α,3-trimethyl//acetic acid
 127 H H CH.sub.3 H H S
  ##STR84##
  CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,4-dimethyl-1-(2-thienyl)//aceticacid 128 H H H H H S
  ##STR85##
  C(CH.sub.3).sub.2 CO C.sub. 2
  H.sub.5 α,α-dimethyl-1-(2-thienyl)//aceticacid 129 H H H H
 H S CH.sub.3 CH.sub.2 CH.sub.2 CO C.sub.2 H.sub.5 1-methyl//  propionic
 acid 130 CH.sub.3 CH.sub.3 CH.sub.3 CH.sub.3
  ##STR86##
  S CH.sub.2CH CH.sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 8-acetoxy-α,3,3,4,4-pentamethyl-1-vinyl//propionic 131 H
 H H H 6-OH S HCCCH.sub.2 CH.sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
 H.sub.5 β,β-diethyl-7-hydroxy-  1-(2-propionyl)//  propionic
 acid 132 CH.sub.3 H HH 7-NO.sub.2 S
  ##STR87##
  CH(n-C.sub.3 H.sub.7)CH.sub.2 CO C.sub.2 H.sub.5 1-cyclobutyl-3-methyl-
  8-nitro-α-propyl//  propionic acid 133 H H CH.sub.3 H 5-CH.sub.3
 S
  ##STR88##
  C(CH.sub.3).sub.2 C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 α,α,β,β4,6-hexamethyl-1-phenyl//propionica
 cid 134 i-C.sub.3
  H.sub.7 H H H 7-Br S
 ##STR89##
  CH(CH.sub.3)CH(C.sub.2 H.sub.5 )CO C.sub.2
  H.sub.5 1-benzyl-8-bromo-αethyl-3-isopropyl-βmethyl//propioni
 cacid 135 C.sub.2 H.sub.5 H C.sub.2
  H.sub.5 H 7-Cl S
 ##STR90##
  CH.sub.2 CH.sub.2 CH.sub.2 CO C.sub.2
  H.sub.5 8-chloro-3,4-diethyl-1-(2-thienyl)//propionic acid 136 CH.sub.3
 H H H H S CH.sub.3 CH.sub.2 C(n-C.sub.3 H.sub.7).sub.2 CO C.sub.2
 H.sub.5 1,3-dimethyl-α,α-  dipropyl//propionic  acid 137
 CH.sub.3 H C.sub.2 H.sub.5 C.sub.2
  H.sub.5 H S CH.sub.2C(CH.sub.3)CH.sub.2 CH(CH.sub.3)C(CH.sub.3).sub.2
 CO CH.sub.3 4,4-diethyl-1-  methalkyl-α,α,β,3-
 tetamethyl//  propionic acid 138 H H CH.sub.3 CH.sub.3 H S HCC C(CH.sub.3
 ).sub.2 CH.sub.2
  CO CH.sub.3 1-ethynyl-β,β,4,4-  tetramethyl//propionic  acid
 139 H H n-C.sub.3
  H.sub.7 H
 ##STR91##
  S
  ##STR92##
  C(C.sub.2 H.sub.5).sub.2 C(C.sub.2
  H.sub.5)CO CH.sub.3 1-cyclopentyl-5-propionoxy-4-propyl- α,β,
 β-triethyl//propionic acid 140 n-C.sub.3 H.sub.7 H H H 4-OCH.sub.3
 S
  ##STR93##
  CH.sub.2 CH(CH.sub.3 (COC.sub.2
  H.sub.5 5-methoxy-α-methyl-1-phenyl-3-propyl//propionic acid 141
 H H i-C.sub.3
  H.sub.7 H 6-benzyl-oxy S
 ##STR94##
  CH.sub.2 CH(C.sub.2 H.sub.5)CO C.sub.2
  H.sub.5 1-benzyl-6-benzyloxy-α-ethyl-4-isopropyl//propionic acid
 142 CH.sub.3 CH.sub.3 CH.sub.3 CH.sub.3 7-Cl S
  ##STR95##
  CH(CH.sub.3)CH.sub.2 CO C.sub.2
  H.sub.5 8-chloro-β,3,3,4,4-pentamethyl-1-(2-thienyl)//propionicacid
  143 C.sub.2 H.sub.5 H H H 5-NO.sub.2 S CH.sub.3 CH(C.sub.2
  H.sub.5).sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5 1-methyl-6-nitro-α,α,  β,β,3-pentaethyl//
  propionic acid 144 C.sub.2 H.sub.5 C.sub.2
  H.sub.5 H H 5-F S CH.sub.2CHCH.sub.2 CH(C.sub.2 H.sub.5)CH(CH.sub.3)CO
 C.sub.2 H.sub.5 1-allyl-6-fluoro-α-  methyl-β,3,3-triethyl//
 propionic acid 145 C.sub.2 H.sub.5 C.sub.2 H.sub.5 H H 4-C.sub. 2
 H.sub.5 S CH.sub.3 CHCH C(n-C.sub.3 H.sub.7)CH.sub.2 CO CH.sub.3
 β  propyl-1-(1-  propynyl)-3,3,5-  triethyl//propionic  acid 146 H
 H H H 6-OC.sub.2
  H.sub.5 S
 ##STR96##
  CH(C.sub.2 H.sub.5)CH(C.sub.2 H.sub.5)CO C.sub.2
  H.sub.5
 ##STR97##
  147 CH.sub.3 CH.sub.3 CH.sub.3 CH.sub.3 6-O-n-C.sub.3 H.sub.7 S
  ##STR98##
  C(CH.sub.3).sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 α,β,β,3,3,4,4-heptamethyl-1-phenyl-7-propoxy//pr
 opionicacid 148 C.sub.2 H.sub.5 C.sub.2 H.sub.5 H H 5-CH.sub.3 S
  ##STR99##
  C(CH.sub.3).sub.2 C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 1-benzyl-3,3-diethyl-α,α,β,β,6-pentamethyl
 //propionic acid 149 n-C.sub.3
  H.sub.7 H H H 4-OH S
 ##STR100##
  C(CH.sub.3).sub.2 C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5
 ##STR101##
  150 H H H H H S CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 CO C.sub.2 H.sub.5
 1-methyl//butyric  acid 151 CH.sub.3 H H H H S C.sub.2
  H.sub.5 CH(C.sub.2 H.sub.5).sub.2 CH.sub.2 CH.sub.2 CO C.sub.2 H.sub.5
 γ,3-dimethyl-1-ethyl//  butyric acid 152 CH.sub.3 CH.sub.3 H H H S
 n-C.sub.3 H.sub.7 C(C.sub.2 H.sub.5).sub.2 CH.sub.2 CH.sub.2 CO C.sub.2
 H.sub.5 γ,γ-diethyl-3,3-  dimethyl-1-propyl//  butyric acid
 153 CH.sub.3 CH.sub.3 n-C.sub.3 H.sub.7 H H S CH.sub.2CH C(n-C.sub.3
 H.sub.7).sub.2 CH(n-C.sub.3 H.sub.7)CH.sub.2 CO C.sub.2
  H.sub.5 3,3-dimethyl-β,γ,γ,4-  tetrapropyl-1-vinyl//
 butyric acid 154 H H H H H S CH.sub.2CHCH.sub.2 [C(CH.sub.3).sub.2
 ].sub.2 CH.sub.2 CO C.sub.2
  H.sub.5 1-allyl-β,β,γ,γ-  tetramethyl//butyric
 acid 155 H H C.sub.2 H.sub.5 C.sub.2
  H.sub.5 6-Cl S CH.sub.2CH [C(C.sub.2 H.sub.5).sub.2 ].sub.2 CH(C.sub.2
 H.sub.5)CO C.sub.2
  H.sub.5 7-chloro-α ,β,β,γ,γ,4-  4-heptaethyl
 -1-vinyl//  butyric acid 156 H H CH.sub.3 H 4-CH.sub.3 S HCCH [C(CH.sub.3
 ).sub.2 ].sub.3 CO C.sub.2
  H.sub.5 1-ethynyl-α,α,β,β,γ,γ-,
 4,5-octamethyl//  butyric acid 157 C.sub.2 H.sub.5 C.sub.2 H.sub.5
 C.sub.2
  H.sub.5 H
 ##STR102##
  S CH.sub.3 CCH CH(C.sub.2 H.sub.5)[C(C.sub.2 H.sub.5)].sub.2 CO C.sub.2
 H.sub.5 6-acetoxy-α,α,β,β,γ,3-,  3,4-octaethy
 l-1-  (1-propynyl)//butyric  acid 158 H H CH.sub.3 CH.sub.3 7-OCH.sub.3
 S
  ##STR103##
  CH.sub.2 [C(CH.sub.3).sub.3 ].sub.2 CO C.sub.2
  H.sub.5 1-cyclobutyl-α,α,β,β,-  4,4-hexamethyl-8-
  methoxy//butyric acid 159 H H H H 4-Br S
  ##STR104##
  CH.sub.2 CH(CH.sub.3)C(CH.sub.3).sub.2 CO C.sub.2
  H.sub.5 5-bromo-1-cyclopentyl-α,α,β-trimethyl//butyric
 acid 160 CH.sub.3 CH.sub.3 H H 4-n-C.sub.3
  H.sub.7 S
 ##STR105##
  CH.sub.2 CH.sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5 1-cyclopropyl-α,α-diethyl-3,3-dimethyl-5-propyl//but
 yricacid 161 H H H H 7-C.sub.2
  H.sub.5 S
 ##STR106##
  CH.sub.2 CH.sub.2 CH(CH.sub.3)CO C.sub.2
  H.sub.5 8-ethyl-α-methyl-1-phenyl//butyric acid 162 CH.sub.3
 CH.sub.3 CH.sub.3 H 5-F S
  ##STR107##
  [CH(CH.sub.3)].sub.3 CO C.sub.2
  H.sub.5 6-fluoro-α,β,γ,3,3,4-hexamethyl-1-phenyl//butyr
 ic acid 163 CH.sub.3 CH.sub.3 H H 4-CH.sub.3 S
  ##STR108##
  CH(C.sub.2 H.sub.5)CH.sub.2 CH(C.sub.2 H.sub.5)CO C.sub.2 H.sub.5
 α,γ-diethyl-1-phenyl-3,3,5-trimethyl//butyric acid 164
 C.sub.2
  H.sub.5 H H H 6-NO.sub.2 S
 ##STR109##
  [CH(CH.sub.3)].sub.3 CO C.sub.2
  H.sub.5 1-benzyl-3-ethyl-7-nitro-α,β,γ-trimethyl//butyr
 icacid 165 CH.sub.3 CH.sub.3 H H 4-n-C.sub.3
  H.sub.7 S
 ##STR110##
  CH.sub.2 [CH(C.sub.2 H.sub.5)].sub.2 CO C.sub.2
  H.sub.5 1-benzyl-α,β-diethyl-3,3-dimethyl-5-propyl//butyric
 acid 166 H H H H 7-OH S
  ##STR111##
  C(CH.sub.3).sub.2 CH.sub.2 C(CH.sub.3).sub.2 CO C.sub.2 H.sub.5
 1-benzyl-8-hydroxy-α,α,γ,γ-tetramethyl//butyric
 acid 167 CH.sub.3 H CH.sub.3 H 4-OC.sub.2
  H.sub.5 S
 ##STR112##
  [C(CH.sub.3).sub.2 ].sub.3 CO C.sub.2
  H.sub.5
 ##STR113##
  168 C.sub.2 H.sub.5 H C.sub.2 H.sub.5 C.sub.2
  H.sub.5 6-Cl S
 ##STR114##
  CH.sub.2 CH.sub.2 C(C.sub.2 H.sub.5).sub.2 CO C.sub.2
  H.sub.5
 ##STR115##

EXAMPLE 169 1-METHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]INDOLE1-CARBOXALDEHYDE (XI; R¹ = CH₃, R², R³, R⁴, R⁵ AND R⁶ = H, AND Y = CO)

A mixture of the starting material, tryptophol (32.2 g, 0.2 mole), acetonyl acetate (23.2 g, 0.2 mole) and 3.2 g of p-toluenesulfonic acid in 500 ml of benzene is refluxed for 11/2 hr. in the presence of a Dean-Stark water trap. The benzene solution is washed with 5% sodium bicarbonate, water, dried and evaporated to afford an oil. The oil is subjected to chromatography on a silica gel column using 10% ethyl acetate in benzene as eluent. The acetate, 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-methanol, acetate is obtained as an oil, nmr(CDCl.sub. 3) δ1.52(S,3H), 2.08(S,3H), 4.35(2H).

This acetate is dissolved in 250 ml of methanol and stirred at room temperature. To this solution is added dropwise 20 ml of 10N NaOH. Hydrolysis is immediate. Most of the methanol is removed under reduced pressure, and water is added. The mixture is rendered neutral and extracted with chloroform. The chloroform extract is dried and evaporated to afford the primary alcohol, 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-methanol (X; R¹ = CH₃, R², R³, R⁴, R⁵ and R⁶ = H, Y = CH₂ and R¹⁷ = H), m.p. 145°-147° C., nmr(CDCl.sub. 3) δ1.43(s,3H), 2.68(t, J = 5.5 cps,2H), 3.65 (d, J = 6 cps, 2H), 3.86 (t, J = 5.5 cps, 2H), after crystallization from benzene-petroleum ether.

N,N-dicyclohexylcarbodiimide (17.36 g, 0.084 mole) is added to a cooled, stirred solution of the above primary alcohol (6.09 g, 0.028 mole) in 63 ml of dimethyl sulfoxidebenzene (2:1) containing trifluoroacetic acid (1.12 ml, 0.014 mole) and pyridine (2.24 ml, 0.028 mole). The reaction is stirred at room temperature under nitrogen for 5 hr. The reaction mixture is now diluted with 600 ml of ether, followed by the dropwise addition of a solution of oxalic acid (7.56 g) in 21 ml of methanol. After thirty minutes, water (600 ml) is added and the insoluble material is collected. The organic phase is washed with water (2X), 5% aqueous sodium bicarbonate (2X) and water (2X). After drying (MgSO₄) the organic phase is evaporated to yield an oil. The oil is purified by chromatography on silica gel. Elution with 10% ether in benzene affords the title compound as eluate, nmr (CDCl.sub. 3) δ1.59(s,3 H), 2.84(t,J = 5.5 cps, 2H), 4.15(t, J = 5.5 cps, 2H).

Oxidation of the latter compound with silver oxide according to the method of Delepine and Bonnet, cited above, affords 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-carboxylic acid, nmr (CDCl.sub. 3) δ1.79(s,3H), 2.83(t,2H), 4.17(t,2H), 9.20(1H), identical to the product obtained in Example 4.

By following the procedure of Example 169 but using as starting material an equivalent amount of the appropriate starting material of formula II, for example, those described in Examples 1 to 168, inclusive, instead of tryptophol, and using an equivalent amount of the appropriate ketoalcohol lower alkyl ester of formula VIII, then the acid compounds of formula I in which R⁷ is hydrogen and Z is hydroxy, for example, the respective products of Examples 1 to 168, inclusive, are obtained.

More specifically exemplified, according to the procedure of Example 169 the use of indole-3-ethanethiol and acetonyl acetate affords 1-methyl-1,3,4,9-tetrahydrothiopyrano[3,4-b]indole-1-acetic acid, identical to the product of Example 3. Similarly, the use of tryptophol and 5-acetoxypentan-2-one affords 1-methyl-1,3,4,9-tetrahydropyrano3,4-b]indole-1-propionic acid, identical to the product of Example 2.

EXAMPLE 170 N,N,1-TRIMETHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]-INDOLE-1-ACETAMIDE (I; R¹ = CH₃, R², R³, R⁴, R⁵, R⁶ AND R⁷ = H, X = O, Y = CH₂ CO AND Z = N(CH₃)₂)

To a stirred solution of 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid (15 g, 0.061 mole), prepared as described in Example 1, in dry tetrahydrofuran (300 ml), cooled to -5° C, is added triethylamine (18.5 g,0.183 mole), followed by ethyl chloroformate (16.6 g, 0.153 mole). The mixture is stirred at -5° C for 2 hr. This mixture, which now contains the mixed anhydride of the above starting material, is added dropwise to a cooled 40% aqueous solution of the amine, dimethylamine (225 ml). The resulting mixture is stirred at room temperature for one-half hour. Most of the tetrahydrofuran is evaporated, and the residue partitioned between chloroform and water. The organic phase is washed with water, dried over sodium sulfate, and evaporated under reduced pressure. The residue is subjected to chromatography on silica gel. Elution with 20% ethyl acetate in benzene, followed by crystallization of the eluate from ethyl acetate affords the title compound, m.p. 149°-151° C., γ _max ^CHCl.sub. 3 3375, 1634 cm^-1.

In the same manner but replacing dimethylamine with an equivalent amount of ammonium hydroxide (concentrated), methylamine (30% aqueous solution), n-hexylamine (20% aqueous solution), diethylamine (30% aqueous solution), or aniline (20% aqueous solution),

1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetamide, m.p. 158°-160° C,

N,1-dimethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetamide, m.p. 138°-140° C,

N-(hexyl)-1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetamide,

N,n-diethyl-1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole1-acetamide, m.p. 99° C, and

N-phenyl-1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetamide, m.p. 205°-208° C, are obtained respectively.

By following the procedure of Example 170 but using as a starting material an equivalent amount of one of the acid compounds of formula I, described in Examples 2 to 168, inclusive, instead of 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid, and using an equivalent amount of an appropriate amine such as ammonia or a primary or secondary amine described in Example 170, then the corresponding amide compound of formula I [Z = NH₂, ##STR116## NHCH₃, N(CH₃)₂, NH(n-C₆ H₁₃) or N(C₂ H₅)₂ ] is obtained. Examples of such amide are listed as products in Tables III and IV together with the appropriate starting material and amine used for the preparation of the amide. In each case the starting material is noted by the example in which it is prepared.

                                  TABLE III                               
__________________________________________________________________________
     NO. OF THE EXAMPLE     PRODUCT: [(PREFIX LISTED BELOW-               
     IN WHICH STARTING      1,3,4,9-TETRAHYDROPYRANO[3,4-b]-              
EX-  MATERIAL IS            INDOLE-1-(SUFFIX LISTED BELOW)]               
AMPLE                                                                     
     PREPARED       AMINE   PREFIX//SUFFIX                                
__________________________________________________________________________
171  2               CH.sub.3 NH.sub.2                                    
                            N,1-dimethyl// propionamide,                  
                            m.p. 149-150° C.                       
172  2              NH.sub.3                                              
                            1-methyl//propionamide                        
173  2              (CH.sub.3).sub.2 NH                                   
                            N,N,1-trimethyl//propionamide                 
174  2              n-C.sub.6 H.sub.13 NH.sub.2                           
                            N-hexyl-1-methyl//propionamide                
175  2              (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-1-methyl//propionamide            
176  4              CH.sub.3 NH.sub.2                                     
                            N,1-dimethyl//carboxamide                     
177  4              NH.sub.3                                              
                            1-methyl//carboxamide, m.p. 188-              
                            189° C.                                
178  4              (CH.sub.3).sub.2 NH                                   
                            N,N,1-trimethyl//carboxamide                  
179  4              n-C.sub.6 H.sub.13 NH.sub.2                           
                            N-hexyl-1-methyl//carboxamide                 
180  4              (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-1-methyl//carboxamide             
181  5              CH.sub.3 NH.sub.2                                     
                            N,3-dimethyl-1-ethyl//carboxamide             
182  8                                                                    
                     ##STR117##                                           
                            8-ethyl-1-ethynyl-N-phenyl// carboxamide      
183  9              (CH.sub.3).sub.2 NH                                   
                            1-cyclopropyl-N,N-dimethyl-4-iso-             
                            propyl//carboxamide                           
184  11             n-C.sub.16 H.sub.13 NH.sub.2                          
                            N-hexyl-1-phenyl//carboxamide                 
185  12             (C.sub.2 H.sub.5).sub.2 NH                            
                            1-benzyl-3-methyl-N,N,3-tri-                  
                            ethyl//carboxamide                            
186  14             (CH.sub.3 ).sub.2 NH                                  
                            N,N,1,4-tetrameethyl//acetamide               
187  15             CH.sub.3 NH.sub.2                                     
                            1-ethyl-N-methyl//acetamide                   
188  15             NH.sub.3                                              
                            1-ethyl//acetamide                            
189  15             (CH.sub.3).sub.2 NH                                   
                            N,N-dimethyl-1-ethyl//acetamide               
190  15             n-C.sub.16 H.sub.13 NH.sub.2                          
                            1-ethyl-N-hexyl//acetamide                    
191  15             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N,1-triethyl//acetamide                     
192  16             CH.sub.3 NH.sub.2                                     
                            N-methyl-1-propyl//acetamide                  
193  16             NH.sub.3                                              
                            1-propyl//acetamide, m.p. 157.5-              
                            160° C                                 
194  16             (CH.sub.3).sub.2 NH                                   
                            N,N-dimethyl-1-propyl//acetamide              
195  16             n-C.sub.6 H.sub.13 NH.sub.2                           
                            N-hexyl-1-propyl//acetamide                   
196  16             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-1-propyl//acetamide               
197  17             CH.sub.3 NH.sub.2                                     
                            1-isopropyl-N-methyl//acetamide               
198  17             NH.sub.3                                              
                            1-isopropyl//acetamide                        
199  17             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-1-isopropyl//acetamide            
200  19             CH.sub.3 NH.sub.2                                     
                            N,3-dimethyl-1-propyl//acetamide              
201  19                                                                   
                     ##STR118##                                           
                            3-methyl-N-phenyl-1-propyl// acetamide        
202  19             (CH.sub.3).sub.2 NH                                   
                            1-propyl-N,N,3-trimethyl//acetamide           
203  19             n-C.sub.6 H.sub.13 NH.sub.2                           
                            N-hexyl-3-methyl-1-propyl//                   
                            acetamide                                     
204  19             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-3-methyl-1-propyl//               
                            acetamide                                     
205  21             CH.sub.3 NH.sub.2                                     
                            N,α,1-trimethyl//acetamide              
206  21             NH.sub.3                                              
                            α,1-dimethyl//acetamide                 
207  21             (CH.sub.3).sub.2 NH                                   
                            N,N,α,1-tetramethyl//acetamide          
208  21             n-C.sub.6 H.sub.13 NH.sub.2                           
                            α,1-dimethyl-N-hexyl//acetamide         
209  21             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-α,1-dimethyl//              
                            acetamide                                     
210  22             CH.sub.3 NH.sub.2                                     
                            1-cyclohexyl-N,α,α-trimethyl//    
                            acetamide                                     
211  23             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-1-phenyl//acetamide               
212  26             CH.sub.3 NH.sub.2                                     
                            N,8-dimethyl-1-propyl//acetamide              
213  31             NH.sub.3                                              
                            6-benzyloxy-1-methyl//acetamide               
214  32             (CH.sub.3).sub.2 NH                                   
                            1-propyl-N,N,5-trimethyl//                    
                            acetamide                                     
215  38             n-C.sub.6 H.sub.13 NH.sub.2                           
                            1-cyclopropyl-α,α-diethyl-3,3-    
                            dimethyl-6-ethoxy-N-hexyl//                   
                            acetamide                                     
216  43             (CH.sub.3).sub.2 NH                                   
                            1-benzyl-N,N,α,α,3-pentamethyl-   
                            8-propionoxy//acetamide                       
217  46             CH.sub.3 NH.sub.2                                     
                            5-iodo-1-isopropyl-N-methyl//                 
                            propionamide                                  
218  49             NH.sub.3                                              
                            1-cyclobutyl-3-methyl-8-nitro-                
                            α-propyl//propionamide                  
219  54             (CH.sub.3).sub.2 NH                                   
                            4,4-diethyl-N,N,α,α,β,3-hexa-
                            7                                             
                            methyl-1-methallyl//propionamide              
220  57             (C.sub.2 H.sub.5).sub.2 NH                            
                            N,N-diethyl-5-methoxy-α-methyl-         
                            1-phenyl-3-propyl//propionamide               
221  62             CH.sub.3 NH.sub.2                                     
                            N-methyl-β-propyl-1-(1-propynyl)-        
                            3,3,5-triethyl//propionamide                  
222  63                                                                   
                     ##STR119##                                           
                            1-cyclopropyl-α,β-diethyl-6-       
                            ethoxy-N-phenyl//propionamide                 
223  67             (CH.sub.3).sub.2 NH                                   
                            N,N,1-trimethyl//butyramide                   
224  67             CH.sub.3 NH.sub.2                                     
                            N,1-dimethyl//butyramide                      
225  67             NH.sub.3                                              
                            1-methyl//butyramide                          
226  67             n-C.sub.6 H.sub.13 NH.sub.2                           
                            N-hexyl-1-methyl//butyramide                  
227  70             CH.sub.3 NH.sub.2                                     
                            β,γ,γ,4-tetrapropyl-N,3,3-   
                            trimethyl-1-vinyl//butyramide                 
228  71             (C.sub.2 H.sub.5).sub.2 NH                            
                            1-allyl-N,N-diethyl-β,β,γ,.gam
                            ma.                                           
                            tetramethyl//butyramide                       
229  73             (CH.sub.3).sub.2 NH                                   
                            N,N,α,α,β,β,γ,.gam
                            ma.,4,5-decamethyl-                           
                            1-ethynyl//butyramide                         
230  76             NH.sub.3                                              
                            5-bromo-1-cyclopentyl-α,α,β- 
                            trimethyl//butyramide                         
231  78             CH.sub.3 NH.sub.2                                     
                            8-ethyl-N,α-dimethyl-1-phenyl//         
                            butyramide                                    
232  80             (C.sub.2 H.sub.5).sub.2 NH                            
                            1-phenyl-N,N,α,γ-tetraethyl-      
                            3,3,5-trimethyl//butyramide                   
233  82             n-C.sub.6 H.sub.13 NH.sub.2                           
                            1-benzyl-α,β-diethyl-3,3-          
                            dimethyl-N-hexyl-5-propyl//                   
                            butyramide                                    
__________________________________________________________________________

                                  TABLE IV                                
__________________________________________________________________________
        NO. OF THE EXAMPLE       PRODUCT: [(PREFIX LISTED BELOW-          
        IN WHICH STARTING        1,3,4,9-TETRAHYDROTHIOPYRANO-            
        MATERIAL IS              [3,4-b]INDOLE-1-(SUFFIX LISTED           
EXAMPLE PREPARED       AMINE     BELOW)] PREFIX/SUFFIX                    
__________________________________________________________________________
234     3              CH.sub.3 NH.sub.2                                  
                                 N,1-dimethyl//acetamide                  
235     3              NH.sub.3  1-methyl//acetamide                      
236     3              n-C.sub.6 H.sub.13 NH.sub.2                        
                                 N-hexyl-1-methyl//acetamide              
237     3              (CH.sub.3).sub.2 NH                                
                                 N,N,1-trimethyl//acetamide, m.p.         
                                 182 - 184° C                      
238     3              (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-1-methyl//acetamide          
239     129            CH.sub.3 NH.sub.2                                  
                                 N,1-dimethyl//propionamide               
240     129            NH.sub.3  1-methyl//propionamide                   
241     129            (CH.sub.3).sub.2 NH                                
                                 N,N,1-trimethyl//propionamide            
242     129            n-C.sub.6 H.sub.13 NH.sub.2                        
                                 N-hexyl-1-methyl//propionamide           
243     129            (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-1-methyl//propion-           
                                 amide                                    
244     87             CH.sub.3 NH.sub.2                                  
                                 N,1-dimethyl//carboxamide                
245     87             NH.sub.3  1-methyl//carboxamide,                   
246     87             (CH.sub.3).sub.2 NH                                
                                 N,N,1-trimethyl//carboxamide             
247     87             n-C.sub.6 H.sub.13 NH.sub.2                        
                                 N-hexyl-1-methyl//carboxamide            
248     87             (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-1-methyl//carboxamide        
249     88             CH.sub.3 NH.sub.2                                  
                                 N,3-dimethyl-1-ethyl//carboxamide        
250     91             NH.sub.3  8-ethyl-1-ethynyl//carboxamide           
251     92             (CH.sub.3).sub.2 NH                                
                                 1-cyclopropyl-N,N-dimethyl-4-iso-        
                                 propyl//carboxamide                      
252     94             n-C.sub.16 H.sub.13 NH.sub.2                       
                                 N-hexyl-1-phenyl//carboxamide            
253     95             (C.sub.2 H.sub.5).sub.2 NH                         
                                 1-benzyl-3-methyl-N,N,3-tri-             
                                 ethyl//carboxamide                       
254     97             (CH.sub.3).sub.2 NH                                
                                 N,N,1,4-tetramethyl//acetamide           
255     98             CH.sub.3 NH.sub.2                                  
                                 1-ethyl-N-methyl//acetamide              
256     98             NH.sub.3  1-ethyl//acetamide                       
257     98             (CH.sub.3).sub.2 NH                                
                                 N,N-dimethyl-1-ethyl//acetamide          
258     98             n-C.sub.16 H.sub.13 NH.sub.2                       
                                 1-ethyl-N-hexyl//acetamide               
259     98             (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N,1-triethyl//acetamide                
260     99             CH.sub.3 NH.sub.2                                  
                                 N-methyl-1-propyl//acetamide             
261     99             NH.sub.3  1-propyl//acetamide                      
262     99             (CH.sub.3).sub.2 NH                                
                                 N,N-dimethyl-1-propyl//acetamide         
263     99             n-C.sub.6 H.sub.13 NH.sub.2                        
                                 N-hexyl-1-propyl//acetamide              
264     99             (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-1-propyl//acetamide          
265     100            CH.sub.3 NH.sub.2                                  
                                 1-isopropyl-N-methyl//acetamide          
266     100            NH.sub.3  1-isopropyl//acetamide                   
267     100            (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-1-isopropyl//acetamide       
268     102            CH.sub.3 NH.sub.2                                  
                                 N,3-dimethyl-1-propyl//acetamide         
269     102            NH.sub.3  3-methyl-1-propyl//acetamide             
270     102            (CH.sub.3).sub.2 NH                                
                                 1-propyl-N,N,3-trimethyl//               
                                 acetamide                                
271     102            n-C.sub.6 H.sub.13 NH.sub.2                        
                                 N-hexyl-3-methyl-1-propyl//              
                                 acetamide                                
272     102            (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-3-methyl-1-propyl//          
                                 acetamide                                
273     104            CH.sub.3 NH.sub.2                                  
                                 N,α,1-trimethyl//acetamide         
274     104            NH.sub.3  α,1-dimethyl//acetamide            
275     104            (CH.sub.3).sub.2 NH                                
                                 N,N,α-1-tetramethyl//acetamide     
276     104            n-C.sub.6 H.sub.13 NH.sub.2                        
                                 α,1-dimethyl-N-hexyl//acetamide    
277     104            (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-α,1-dimethyl//         
                                 acetamide                                
278     105            CH.sub.3 NH.sub.2                                  
                                 1-cyclohexyl-N,α,α-trimethyl/
                                 /                                        
                                 acetamide                                
279     106            (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-1-phenyl//acetamide          
280     109            CH.sub.3 NH.sub.2                                  
                                 N,8-dimethyl-1-propyl//acetamide         
281     111            NH.sub.3  6-bromo-1-propyl//acetamide              
282     117            (CH.sub.3).sub.2 NH                                
                                 α,α-diethyl-N,N-dimethyl-8-fl
                                 uoro-                                    
                                 1-vinyl//acetamide                       
283     121            n-C.sub.6 H.sub.13 NH.sub.2                        
                                 1-cyclopropyl-α,α-diethyl-3,3
                                 -                                        
                                 dimethyl-6-ethoxy-N-hexyl//              
                                 acetamide                                
284     126            (CH.sub.3).sub.2 NH                                
                                 1-benzyl-N,N,α,α,3-pentamethy
                                 l-                                       
                                 8-propionoxy//acetamide                  
285     128            CH.sub.3 NH.sub.2                                  
                                 1-(2-thienyl)-N,α,α-trimethyl
                                 //                                       
                                 acetamide                                
286     132            NH.sub.3  1-cyclobutyl-3-methyl-8-nitro-           
                                 α-propyl//propionamide             
287     137            (CH.sub.3).sub.2 NH                                
                                 4,4-diethyl-N,N,α,α,β,3-
                                 hexamethyl-1-methallyl//                 
                                 propionamide                             
288     140            (C.sub.2 H.sub.5).sub.2 NH                         
                                 N,N-diethyl-5-methoxy-α-methyl-1-  
                                 phenyl-3-propyl//propionamide            
289     145            CH.sub.3 NH.sub.2                                  
                                 N-methyl-β-propyl-1-(1-propynyl)-   
                                 3,3,5-triethyl//propionamide             
290     146                                                               
                        ##STR120##                                        
                                 1-cyclopropyl-α,β-diethyl-6-  
                                 ethoxy-N-phenyl//propionamide            
291     150            (CH.sub.3).sub.2 NH                                
                                 N,N,1-trimethyl//butyramide              
292     150            CH.sub.3 NH.sub.2                                  
                                 N,1-dimethyl//butyramide                 
293     150                                                               
                        ##STR121##                                        
                                 1-methyl-N-phenyl//butyramide            
294     150            n-C.sub.6 H.sub.13 NH.sub.2                        
                                 N-hexyl-1-methyl//butyramide             
295     153            CH.sub.3 NH.sub.2                                  
                                 β,γ,γ,4-tetrapropyl-N,3,
                                 3-                                       
                                 trimethyl-1-vinyl//butyramide            
296     154            (C.sub.2 H.sub.5).sub.2 NH                         
                                 1-allyl-N,N-diethyl-β,β,γ
                                 ,γ-                                
                                 tetramethyl//butyramide                  
297     155            (CH.sub. 3).sub.2 NH                               
                                 7-chloro-N,N-dimethyl-α,β,.bet
                                 a.,γ,γ-                      
                                 4,4-heptaethyl-1-ethynyl//butyramide     
298     159            NH.sub.3  5-bromo-1-cyclopentyl-α,α,.be
                                 ta.-                                     
                                 trimethyl//butyramide                    
299     161            CH.sub.3 NH.sub.2                                  
                                 N,α-dimethyl-8-ethyl-1-phenyl//    
                                 butyramide                               
300     163            (C.sub.2 H.sub.5).sub.2 NH                         
                                 1-phenyl-N,N,α,γ-tetraethyl- 
                                 3,3,5-trimethyl//butyramide              
301     165            n-C.sub.6 H.sub.13 NH.sub.2                        
                                 1-benzyl-α,β-diethyl-3,3-dimet
                                 hyl- -   N-hexyl-5-propyl//butyramide    
302     168            CH.sub.3 NH.sub.2                                  
                                 7-chloro-N-methyl-α,α,3,4,4- 
                                 pentaethyl-1-(2-thienyl)//               
                                 butyramide                               
__________________________________________________________________________

EXAMPLE 303 1-METHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]INDOLE1-CARBOXAMIDE (I; R¹ = CH₃, R², R³, R⁴, R⁵, R⁶ AND R⁷ = H, X = O, Y = CO AND Z = NH₂)

By following the procedure of Example 1 but using an equivalent amount of pyruvamide instead of ethyl acetoacetate, 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-carboxamide, m.p. 188°- 189° C. after recrystallization from benzene-hexane, identical with the product of Example 177, is obtained.

In the same manner but using an equivalent amount of the appropriate starting material of formula II in place of tryptophol together with the appropriate α-, β-, γ- or δ-ketoamide, the products listed in Tables III and IV may be obtained. For example, by using tryptophol (II; R², R³, R⁴, R⁵, R⁶ = H and X' = OH) and the β-ketoamide, N,N-dimethyl-acetoacetamide, in the procedure of this Example, N,N,1-trimethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetamide, identical with the product of Example 170, is obtained.

EXAMPLE 304 1,9-DIMETHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]INDOLE-1-ACETIC ACID (I; R¹ and R⁷ = CH₃, R², R³, R⁴, R⁵ AND R⁶ = H, X = O, Y = CH₂ CO AND Z = OH

1-Methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid (10 g., 0.04 mole), prepared as described in Example 1, in 150 ml. of tetrahydrofuran is added dropwise to a stirred suspension of sodium hydride (4.4 g. of 55% dispresion) in 200 ml. of tetrahydrofuran. This mixture is heated at 50° C. with stirring for 2 hr. Methyl iodide (14.2 g. 0.1 mole) is added dropwise and heating and stirring is continued for a further 2 hr.

After cooling, water is added until the solution is clear. The tetrahydrofuran is evaporated off under reduced pressure, the residue is partition between water and benzene. The aqueous phase is washed once with benzene, made acidic with HCl, and extracted with benzene (3x). The organic phase is washed with water, dried over sodium sulfate and treated with charcoal. The organic layer is evaporated. The residue is crystallized from benzene and then ether-petroleum ether to afford the title compound, m.p. 105°-108° C., nmr (CDCl₃) δ 1.73 (S,3H), 2.83 (t, J = 5.5 2H), 3.0 (2H), 3.68 (3H), 4.08 (t, J = 5.5, 2H), 7.34 (4H), 9.47 (1H).

In the same manner but replacing methyl iodide with an equivalent amount of ethyl iodide, or propyl iodide 9-ethyl-1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid, m.p. 134°- 136° C., and 1-methyl-9-propyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid, m.p. 120°-122° C., are obtained, respectively. The corresponding ethyl ester of the latter compound, 1-methyl-9-propyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid ethyl ester has m.p. 72°-74° C.

By following the procedure of Example 304 but using the starting material an equivalent amount of the acid compounds of formula I, compounds of formula I in which R⁷ is hydrogen and Z is hydroxy, described in Examples 1 to 168, inclusive, instead of 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]-indole-1-acetic acid, and using an equivalent amount of an appropriate lower alkyl or lower alkenyl halide, then the corresponding N-alkylated acid compounds of formula I in which R⁷ is lower alkyl or lower alkenyl are obtained. Examples of these latter compounds are listed as products in Tables V and VI together with the appropriate starting material and alkyl or alkynyl halide used for their preparation. In each case the starting material is noted by the Example in which it is prepared.

                                  TABLE V                                 
__________________________________________________________________________
        NO. OF THE EXAMPLE          PRODUCT: [(PREFIX LISTED BELOW-       
        IN WHICH STARTING           1,3,4,9-TETRAHYDROPYRANO[3,4-b]-      
        MATERIAL IS    ALKYL OR ALKENYL                                   
                                    INDOLE-1-(SUFFIX LISTED BELOW)]       
EXAMPLE PREPARED       HALIDE       PREFIX//SUFFIX                        
__________________________________________________________________________
305      1             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-methyl//acetic acid,        
                                    m.p.103 - 105° C.              
306      1             CH.sub.2 ═CHBr                                 
                                    1-methyl-9-vinyl//acetic acid         
307      1             CH.sub.2 ═C(CH.sub.3)CH.sub.2 Br               
                                    1-methyl-9-methallyl//acetic acid     
308      2             n-C.sub.3 H.sub.7 I                                
                                    1-methyl-9-propyl//propionic acid     
309      2             CH.sub.3 I   1,9-dimethyl//propionic acid, m.p.    
                                    129 - 130° C                   
310      2             CH.sub.2 ═CHBr                                 
                                    1-methyl-9-vinyl//propionic acid      
311      2             CH.sub.2 ═CHCH.sub.2 Cl                        
                                    9-allyl-1-methyl//propionic acid      
312      4             CH.sub.3 I   1,9-dimethyl//carboxylic acid         
313      4             CH.sub.2 ═CHBr                                 
                                    1-methyl-9-vinyl//carboxylic acid     
314      7             CH.sub.3 I   6-hydroxy-1-(1-propenyl)-3,3,9-       
                                    trimethyl//carboxylic acid            
315      9             CH.sub.3 CH═CHBr                               
                                    1-cyclopropyl-4-isopropyl-9-          
                                    (1-propenyl)//carboxylic acid         
316     11             i-C.sub.3 H.sub.7 I                                
                                    9-isopropyl-1-phenyl//carboxylic      
                                    acid                                  
317     15             CH.sub.3 I   1-ethyl-9-methyl//acetic acid         
318     15             C.sub.2 H.sub.5 Cl                                 
                                    1,9-diethyl//acetic acid              
319     15             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-ethyl//acetic acid          
320     15             CH.sub.2 ═CHBr                                 
                                    1-ethyl-9-vinyl//acetic acid          
321     16             CH.sub.3 I   9-methyl-1-propyl//acetic acid        
322     16             n-C.sub.3 H.sub.7 Cl                               
                                    1,9-dipropyl//acetic acid             
323     16             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-propyl//acetic acid         
324     16             CH.sub.2 ═C(CH.sub.3)CH.sub.2 Br               
                                    9-methallyl-1-propyl//acetic acid     
325     17             CH.sub.3 I   9-methyl-1-isopropyl//acetic acid     
326     17             CH.sub.2 ═CHBr                                 
                                    1-isopropyl-9-vinyl//acetic acid      
327     19             n-C.sub.3 H.sub.7 Cl                               
                                    1,9-dipropyl-3-methyl//acetic acid    
328     19             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-3-methyl-1-propyl//acetic     
                                    acid                                  
329     21             CH.sub.3 I   α,1,9-trimethyl//acetic acid    
330     21             CH.sub.2 ═CHBr                                 
                                    α,1-dimethyl-1-vinyl//acetic    
                                    acid                                  
331     22             n-C.sub.3 H.sub.7 Cl                               
                                    1-cyclohexyl-α,α-dimethyl-
                                    9-                                    
                                    propyl//acetic acid                   
332     27             CH.sub.2 ═CHCH.sub.2 I                         
                                    9-allyl-1-(2-thienyl)//acetic acid    
333     29             CH.sub.3 Cl  1,9-dimethyl-6-methoxy//acetic acid   
334     34             CH.sub.2 ═CHBr                                 
                                    6-nitro-1-propyl-9-vinyl//            
                                    acetic acid                           
335     40             C.sub.2 H.sub.5 Cl                                 
                                    α,3-dimethyl-9-ethyl-1-phenyl-  
                                    4,4,5-tripropyl//acetic acid          
336     42             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-benzyl-α,α-diiso
                                    propyl-                               
                                    3,3,4,4,5-pentaethyl//acetic acid     
337     48             C.sub.2 H.sub.5 I                                  
                                    7-hydroxy-1-(2-propynyl)-β,β
                                    ,9-                                   
                                    triethyl//propionic acid              
338     49             CH.sub.3 I   1-cyclobutyl-3,9-dimethyl-8-nitro-    
                                    Ε-propyl//propionic acid      
339     54             CH.sub.2 ═C(CH.sub.3 CH.sub.2 Cl               
                                    4,4-diethyl-1,9-dimethally-α,.al
                                    pha.,β,-                         
                                    3-tetramethyl//propionic acid         
340     59             CH.sub.2 ═CHCH.sub. 2 Br                       
                                    9-allyl-8-chloro-β,3,3,4,4-      
                                    pentamethyl-1-(2-thienyl)//           
                                    propionic acid                        
341     60             CH.sub.2 ═CHCl                                 
                                    1-methyl-6-nitro-α,α,.beta
                                    .,β,3-penta-                     
                                    ethyl-9-vinyl//propionic acid         
342     63             C.sub.2 H.sub.5 Cl                                 
                                    1-cyclopropyl-6-ethoxy-α,β,
                                    9-                                    
                                    triethyl//propionic acid              
343     67             CH.sub.3 I   1,9-dimethyl//butyric acid            
344     67             CH.sub.2 ═CHCH.sub.2 Cl                        
                                    9-allyl-1-methyl//butyric acid        
345     68             C.sub.2 H.sub.5 Cl                                 
                                    1,9-diethyl-γ,3-dimethyl//butyri
                                    c                                     
                                    acid                                  
346     70             CH.sub.2 ═CHBr                                 
                                    3,3-dimethyl-1,9-divinyl-β,.gamma
                                    .,γ,-                           
                                    4-tetrapropyl//butyric acid           
347     72             CH.sub.2 ═CHBr                                 
                                    7-chloro-1,9-divinyl-α,β,.b
                                    eta.,γ,γ-                 
                                    4-heptaethyl//butyric acid            
348     78             C.sub.2 H.sub.5 I                                  
                                    8,9-diethyl-α-methyl-1-phenyl// 
                                    butyric acid                          
349     82             CH.sub.3 I   1-benzyl-α,β-diethyl-5-prop
                                    yl- -   3,3,9-trimethyl//butyric      
                                    acid                                  
350     85             C.sub.2 H.sub.5 Br                                 
                                    7-chloro-α,α,3,4,4,9-hexae
                                    thyl-                                 
                                    1-(2-thienyl)//butyric                
__________________________________________________________________________
                                    acid

                                  TABLE VI                                
__________________________________________________________________________
        NO. OF THE EXAMPLE          PRODUCT: [(PREFIX LISTED BELOW-1,3-   
        IN WHICH STARTING           4,9-TETRAHYDROTHIOPYRANO[3,4-b]-      
        MATERIAL IS    ALKYL OR ALKENYL                                   
                                    INDOLE-1-(SUFFIX LISTED BELOW)]       
EXAMPLE PREPARED                                                          
        HALIDE         PREFIX//SUFFIX                                     
__________________________________________________________________________
351     3              CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-methyl//acetic acid         
352     3              CH.sub.3 I   1,9-dimethyl//acetic acid             
353     3              CH.sub.2 ═C(CH.sub.3)CH.sub.2 Br               
                                    1-methyl-9-methallyl//acetic          
                                    acetic acid                           
354     129            n-C.sub.3 H.sub.7 I                                
                                    1-methyl-9-propyl//propionic          
                                    acid                                  
355     129            CH.sub.3 I   1,9-dimethyl//propionic acid          
356     129            CH.sub.2 ═CHBr                                 
                                    1-methyl-9-vinyl//propionic acid      
357     129            CH.sub.2 ═CHCH.sub.2 Cl                        
                                    9-allyl-1-methyl//propionic acid      
358     87             CH.sub.3 I   1,9-dimethyl//carboxylic acid         
359     87             CH.sub.2 ═CHBr                                 
                                    1-methyl-9-vinyl//carboxylic          
                                    acid                                  
360     90             CH.sub.3 I   6-hydroxy-1-(1-propenyl)-3,3,9-       
                                    trimethyl//carboxylic acid            
361     92             CH.sub.3 CH═CHBr                               
                                    1-cyclopropyl-4-isopropyl-9-          
                                    (1-propenyl)//carboxylic acid         
362     94             2-C.sub.3 H.sub.7 I                                
                                    9-isopropyl-1-phenyl//carboxylic      
                                    acid                                  
363     98             CH.sub.3 I   1-ethyl-9-methyl//acetic acid         
364     98             C.sub.2 H.sub.5 Cl                                 
                                    1,9-diethyl//acetic acid              
365     98             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-ethyl//acetic acid          
366     98             CH.sub.2 ═CHBr                                 
                                    1-ethyl-9-vinyl//acetic acid          
367     99             CH.sub.3 I   9-methyl-1-propyl//acetic acid        
368     99             n-C.sub.3 H.sub.7 Cl                               
                                    1,9-dipropyl//acetic acid             
369     99             CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-propyl//acetic acid         
370     99             CH.sub.2 ═C(CH.sub.3)CH.sub.2 Br               
                                    9-methyl-1-propyl//acetic             
                                    acid                                  
371     100            CH.sub.3 I   9-methyl-1-isopropyl//acetic          
                                    acid                                  
372     100            CH.sub.2 ═CHBr                                 
                                    1-isopropyl-9-vinyl//acetic           
                                    acid                                  
373     102            n-C.sub.3 H.sub.7 Cl                               
                                    1,9-dipropyl-3-methyl//acetic         
                                    acid                                  
374     102            CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-3-methyl-1-propyl//           
                                    acetic acid                           
375     104            CH.sub.3 I   α,1,9-trimethyl//acetic acid    
376     104            CH.sub.2 ═CHBr                                 
                                    α,1-dimethyl-1-vinyl//acetic    
                                    acid                                  
377     105            n-C.sub.3 H.sub.7 Cl                               
                                    1-cyclohexyl-α,α-dimethyl-
                                    9-                                    
                                    propyl//acetic acid                   
378     110            CH.sub.2 ═CHCH.sub.2 I                         
                                    9-allyl-1-(2-thienyl)//acetic         
                                    acid                                  
379     112            CH.sub.3 Cl  1,9-dimethyl-6-methoxy//              
                                    acetic acid                           
380     117            CH.sub.2 ═CHBr                                 
                                    α,α-diethyl-1,9-divinyl-8-
                                    fluoro//acetic acid                   
381     123            C.sub.2 H.sub.5 Cl                                 
                                    α,3-dimethyl-9-ethyl-1-phenyl-  
                                    4,4,5-tripropyl//acetic               
                                    acid                                  
382     125            CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-1-benzyl-α,α-     
                                    diisopropyl-3,3,4,4,5-                
                                    pentaethyl//acetic acid               
383     131            C.sub.2 H.sub.5 I                                  
                                    7-hydroxy-1-(2-propynyl)-             
                                    β,β,9-triethyl//propionic   
                                    acid                                  
384     132            CH.sub.3 I   1-cyclobutyl-3,9-dimethyl-8-          
                                    nitro-α-propyl//propionic acid  
385     137            CH.sub.2 ═C(CH.sub.3)CH.sub.2 Cl               
                                    4,4-diethyl-1,9-dimethallyl-          
                                    α,α,β,3-tetramethyl//
                                    propionic                             
                                    acid                                  
386     142            CH.sub.2 ═CHCH.sub.2 Br                        
                                    9-allyl-8-chloro-β,3,3,4,4-      
                                    pentamethyl-1-(2-thienyl)//           
                                    propionic acid                        
387     143            CH.sub.2 ═CHCl                                 
                                    1-methyl-6-nitro-α,α,.beta
                                    .,β,3-penta-                     
                                    ethyl-9-vinyl//propionic acid         
388     146            C.sub.2 H.sub.5 Cl                                 
                                    1-cyclopropyl-6-ethoxy-α,β,
                                    9-                                    
                                    triethyl//propionic acid              
389     150            CH.sub.3 I   1,9-dimethyl//butyric acid            
390     150            CH.sub.2 ═CHCH.sub.2 Cl                        
                                    9-allyl-1-methyl//butyric acid        
391     151            C.sub.2 H.sub.5 Cl                                 
                                    1,9-diethyl-γ,3-dimethyl//      
                                    butyric acid                          
392     153            CH.sub.2 ═CHBr                                 
                                    3,3-dimethyl-1,9-divinyl-β,.gamma
                                    .,γ,-                           
                                    4-tetrapropyl//butyric acid           
393     155            CH.sub.2 ═CHBr                                 
                                    7-chloro-1,9-divinyl-α,β,.b
                                    eta.,γ,γ,-                
                                    4,4-heptaethyl//butyric acid          
394     161            C.sub.2 H.sub.5 I                                  
                                    8,9-diethyl-α-methyl-1-phenyl// 
                                    butyric acid                          
395     165            CH.sub.3 I   1-benzyl-α,β-diethyl-5-prop
                                    yl-                                   
                                    3,3,9-trimethyl//butyric acid         
396     168            C.sub.2 H.sub.5 Br                                 
                                    7-chloro-α,α,3,4,4,9-hexae
                                    thyl-                                 
                                    1-(2-thienyl)//butyric                
__________________________________________________________________________
                                    acid

EXAMPLE 397

By following the procedure of Example 304 but using as the starting material an equivalent amount of the ester compounds of formula I in which R⁷ is hydrogen and Z is lower alkoxy, obtained prior to hydrolysis in Example 1 and 3 to 168, inclusive, instead of 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]-indole-1-acetic acid, and using an equivalent amount of an appropriate lower alkyl or lower alkenyl halide, then the corresponding N-alkylated ester compounds of formula I in which R⁷ is lower alkyl or lower alkenyl, are obtained.

For example, when following the procedure of Example 304, the replacement of 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid by an equivalent amount of its corresponding ethyl ester, described in Example 1, and then use the same alkyl halide, methyl iodide, affords 1,9-dimethyl-1,3,4,9-tetrahydropyrano[3,4 -b]indole-1-acetic acid ethyl ester.

Similarly, the replacement of 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid by an equivalent amount of 1-methyl-1,3,4,9-tetrahydrothiopyrano[3,4-b]indole1-acetic acid methyl ester, described in Example 3, affords 1,9-dimethyl-1,3,4,9-tetrahydrothiopyrano[3,4b]indole-1-acetic acid methyl ester.

By following the procedure of Example 170 but using as the starting material an equivalent amount of one of the N-alkylated acid compounds of formula I, described in Examples 304 to 396, inclusive, instead of 1-methyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid, and using an equivalent amount of an appropriate amine such as ammonia or a primary or secondary amine, described in Example 170, then the corresponding amide compound of formula I in which R⁷ is lower alkyl or lower alkenyl and Z is amino, lower alkyl amino, di(lower)alkylamino or phenylamino, is obtained. Examples of such amides are listed as products in Tables VII and VIII together with the appropriate starting material, noted by the example in which it is prepared, and the amine used for the preparation of the amide.

                                  TABLE VII                               
__________________________________________________________________________
        NO. OF THE EXAMPLE   PRODUCT:[(PREFIX LISTED BELOW-               
        IN WHICH STARTING    1,3,4,9-TETRAHYDROPYRANO[3,4-b]-             
        MATERIAL IS          INDOLE-1-(SUFFIX LISTED BELOW)]              
EXAMPLE PREPARED      AMINE  PREFIX//SUFFIX                               
__________________________________________________________________________
398     304           (CH.sub.3).sub.2 NH                                 
                             N,N,1,9-tetramethyl//acetamide,              
                             ν.sub.max.sup.CHCl 1620, 1070 cm.sup.-1,  
                             nmr                                          
                             (CDCl.sub.3) δ 1.71, 2.76, 2.89,       
                             3.00,                                        
                             3.71                                         
399     304           CH.sub.3 NH.sub.2                                   
                             N,1,9-trimethyl//acetamide, m.p.             
                             136 - 138° C.                         
400     304           NH.sub.3                                            
                             1,9-dimethyl//acetamide, m.p.                
                             105 - 106° C.                         
401     304           n-C.sub.6 H.sub.13 NH.sub.2                         
                             1,9-dimethyl-N-hexyl//acetamide              
402     304           (C.sub.2 H.sub.5).sub.2 NH                          
                             N,N-diethyl-1,9-dimethyl//                   
                             acetamide, ν.sub.max.sup.CHCl.sbsp.3 1630 
                             cm.sup.-1,                                   
                             nmr (CDCl.sub.3) δ 1.10, 1.74, 2.80,   
                             3.97                                         
403     305           CH.sub.3 NH.sub.2                                   
                             9-allyl-N,1-dimethyl//acetamide              
404     305           (CH.sub.3).sub.2 NH                                 
                             9-allyl-N,N,1-trimethyl//                    
                             acetamide                                    
405     309           CH.sub.3 NH.sub.2                                   
                             N,1,9-trimethyl//propionamide,               
                             m.p. 148-150° C                       
406     309           (C.sub.2 H.sub. 5).sub.2 NH                         
                             1,9-dimethyl-N,N-diethyl//                   
                             propionamide                                 
407     311           NH.sub.3                                            
                             9-allyl-1-methyl//propionamide               
408     311           (CH.sub.3).sub.2 NH                                 
                             9-allyl-N,N,1-trimethyl//                    
                             propionamide                                 
409     313           CH.sub.3 NH.sub.2                                   
                             N,1-dimethyl-9-vinyl//                       
                             carboxamide                                  
410     314           (C.sub.2 H.sub.5).sub.2 NH                          
                             N,N-diethyl-6-hydroxy-1-                     
                             (1-propenyl)-3,3,9-trimethyl//               
                             carboxamide                                  
411     316           n-C.sub.6 H.sub.3 NH.sub.2                          
                             N-hexyl-9-isopropyl-1-phenyl//               
                             carboxamide                                  
412     317           CH.sub.3 NH.sub.2                                   
                             N,9-dimethyl-1-ethyl//acetamide              
413     319           (C.sub.2 H.sub.5).sub.2 NH                          
                             9-allyl-N,N,1-triethyl//                     
                             acetamide                                    
414     320           (CH.sub.3).sub.2 NH                                 
                             N,N-dimethyl-1-ethyl-9-vinyl//               
                             acetamide                                    
415     321           CH.sub.3 NH.sub.2                                   
                             N,9-dimethyl-1-propyl//                      
                             acetaide                                     
416     323           (C.sub.2 H.sub.5).sub.2 NH                          
                             9-allyl-N,N-diethyl-1-propyl//               
                             acetamide                                    
417     331           CH.sub.3 NH.sub.2                                   
                             1-cyclohexyl-9-propyl-N,α,α-     
                             trimethyl//acetamide                         
418     332           n-C.sub.6 H.sub.13 NH.sub.2                         
                             9-allyl-N-hexyl-1-(2-thienyl)//              
                             acetamide                                    
419     333           (CH.sub.3).sub.2 NH                                 
                             6-methoxy-N,N,1,9-tetramethyl//              
                             acetamide, m.p. 118-120° C.           
420     335           CH.sub.3 NH.sub.2                                   
                             9-ethyl-1-phenyl-4,4,5-                      
                             tripropyl-N,α,3-trimethyl//            
                             acetamide                                    
421     341           (C.sub.2 H.sub.5).sub.2 NH                          
                             N,N,α,α,β,β,3-heptaethy
                             l-1-                                         
                             methyl-6-nitro-9-vinyl//                     
                             propionamide                                 
422     342           (C.sub.2 H.sub.5).sub.2 NH                          
                             1-cyclopropyl-6-methoxy-N,N,-                
                             α,β,9-pentaethyl-9-vinyl//        
                             propionamide                                 
423     343           CH.sub.3 NH.sub.2                                   
                             N,1,9-trimethyl//butyramide                  
424     344           (CH.sub.3).sub.2 NH                                 
                             9-allyl-N,N,1-trimethyl//                    
                             butyramide                                   
425     345           NH.sub.3                                            
                             1,9-diethyl-γ,3-dimethyl//             
                             butyramide                                   
426     349           CH.sub.3 NH.sub.2                                   
                             1-benzyl-α,β-diethyl-5-propyl-    
                             N,3,3,9-tetramethyl//                        
                             butyramide                                   
__________________________________________________________________________

                                  TABLE VIII                              
__________________________________________________________________________
        NO. OF THE EXAMPLE   PRODUCT:[(PREFIX LISTED BELOW-1,3,           
        IN WHICH STARTING    4,9-TERRAHYDROTHIOPYRANO[3,4-b]-             
        MATERIAL IS          INDOLE-1-(SUFFIX LISTED BELOW)]              
EXAMPLE PREPARED      AMINE  PREFIX//SUFFIX                               
__________________________________________________________________________
427     352           (CH.sub.3).sub.2 NH                                 
                             N,N,1,9-tetramethyl//acetamide,              
                             ν.sub.max.sup.CHCl.sbsp.3 1625 cm, nmr    
                             (CDCl.sub.3),                                
                             δ 2.23, 3,65                           
428     352           CH.sub.3 NH.sub.2                                   
                             N,1,9-trimethyl//acetamide, m.p.             
                             127-128° C.                           
429     352           NH.sub.3                                            
                             1,9-dimethyl//acetamide                      
430     352           n-C.sub.6 H.sub.13 NH.sub.2                         
                             1,9-dimethyl-N-hexyl//acetamide              
431     352           (C.sub.2 H.sub.5).sub.2 NH                          
                             N,N-diethyl-1,9-dimethyl//                   
                             acetamide                                    
432     351           CH.sub.3 NH.sub.2                                   
                             9-allyl-N,1-dimethyl//acetamide              
433     351           (CH.sub.3).sub.2 NH                                 
                             9-allyl-N,N,1-trimethyl//                    
                             acetamide                                    
434     355           CH.sub.3 NH.sub.2                                   
                             N,1,9-trimethyl//propionamide                
435     355           (C.sub.2 H.sub.5).sub.2 NH                          
                             1,9-dimethyl-N,N-diethyl//                   
                             propionaide                                  
436     357           NH.sub.3                                            
                             9-allyl-1-methyl//propionamide               
437     357           (CH.sub.3).sub.2 NH                                 
                             9-allyl-N,N,1-trimethyl//                    
                             propionamide                                 
438     359           CH.sub.3 NH.sub.2                                   
                             N,1-dimethyl-9-vinyl//                       
                             carboxamide                                  
439     360           (C.sub.2 H.sub.5).sub.2 NH                          
                             N,N-diethyl-6-hydroxy-1-                     
                             (1-propenyl)-3,3,9-trimethyl//               
                             carboxamide                                  
440     362           n-C.sub.6 H.sub.3 NH.sub.2                          
                             N-hexyl-9-isopropyl-1-phenyl//               
                             carboxamide                                  
441     363           CH.sub.3 NH.sub.2                                   
                             N,9-dimethyl-1-ethyl//                       
                             acetamide                                    
442     365           (CH.sub.2 H.sub.5).sub.2 NH                         
                             9-allyl-N,N,1-triethyl//                     
                             acetamide                                    
443     366           (CH.sub.3).sub.2 NH                                 
                             N,N-dimethyl-1-ethyl-9-vinyl//               
                             acetamide                                    
444     367           CH.sub.3 NH.sub.2                                   
                             N,9-dimethyl-1-propyl//acetamide             
445     369           (C.sub.2 H.sub.5).sub.2 NH                          
                             9-allyl-N,N-diethyl-1-propyl//               
                             acetamide                                    
446     377           CH.sub.3 NH.sub.2                                   
                             1-cyclohexyl-9-propyl-N,α,α-     
                             trimethyl//acetamide                         
447     378           n-C.sub.6 H.sub.13 NH.sub.2                         
                             9-allyl-N-hexyl-1-(2-thienyl)//              
                             acetamide                                    
448     379           (CH.sub.3).sub.2 NH                                 
                             6-methoxy-N,N,1,9-tetramethyl//              
                             acetamide                                    
449     381           CH.sub.3 NH.sub.2                                   
                             9-ethyl-1-phenyl-4,4,5-                      
                             tripropyl-N,α,3-trimethyl//            
                             acetamide                                    
450     387           (C.sub.2 H.sub.5).sub.2 NH                          
                             N,N,α,α,β,β,3-heptaethy
                             l-1-                                         
                             methyl-6-nitro-9-vinyl//                     
                             propionamide                                 
451     388           (C.sub.2 H.sub.5).sub.2 NH                          
                             1-cyclopropyl-6-ethoxy-N,N,-                 
                             α,β,9-pentaethyl//propionamide    
452     389           CH.sub.3 NH.sub.2                                   
                             N,1,9-trimethyl//butyramide                  
453     390           (CH.sub.3).sub.2 NH                                 
                             9-allyl-N,N,1-trimethyl//                    
                             butyramide                                   
454     391           NH.sub.3                                            
                             1,9-diethyl-γ,3-dimethyl//             
                             butyramide                                   
455     395           CH.sub.3 NH.sub.2                                   
                             1-benzyl-α,β -diethyl-5-propyl-   
                             N,3,3,9-tetramethyl//butyramide              
__________________________________________________________________________

EXAMPLE 456 6-HYDROXY-1-METHYL-1,3,4,9-TETRAHYDROPYRANO[3,4-b]-INDOLE-1-ACETIC ACID (I; R¹ = CH₃, R², R³, R⁴, R⁵ AND R⁷ = H, R⁶ = 6-OH, X = O, Y = CH₂ CO and Z = OH)

A mixture of 6-benzyloxy-1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid (5.3 g., 0.015 mole), prepared as described in Example 31, in 250 ml. of anhydrous ethanol, and 1.1 g. of 10% palladium on carbon is stirred at room temperature under a hydrogen atmosphere until no more hydrogen is being taken up by the reaction mixture. The catalyst is removed by filtration through diatomaceous earth (Celite) and the filtrate concentrated. The residue is recrystallized from ethanol-benzene to afford the title compound, m.p. 170°-171° C.

The corresponding benzylamine salt is prepared by the mixing of equimolar ethereal solutions of benzylamine and the above product. The resulting solid is recrystallized from acetonitrile to afford 6-hydroxy-1-methyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid benzylamine salt, m.p. 191°-193° C. The corresponding acetate is prepared by allowing a mixture of the title compound and a five molar excess of acetic anhydride in pyridine solution to stand for 24 hr. Dilution of the mixture with water extraction with ether and recrystallization of the extract residue from benzene-petroleum ether, affords 6-acetoxy-1-methyl-1,3,4,9-tetrahydro[3,4-b]indole-1-acetic acid, identical with the product of Example 30.

Table IX provides further examples of the compounds of this invention. The remarks relating to procedure, starting material and product applied to Table I are applicable also to Table IX. Note also that starting materials of both formulae II and IIa are utilized.

                                  TABLE IX                                
__________________________________________________________________________
                                               PRODUCT:                   
                              KETOESTER        [(PREFIX LISTED            
                              OF               BELOW)-1,3,4,9-            
                              FORMULA          TETRAHYDROPYRANO-          
                              VI               [3,4-b]INDOLE-1-           
 STARTING MATERIAL OF  FORMULA IIa                                        
                               ##STR122##       (SUFFIX LISTED BELOW)]    
EX.                                                                       
   R.sup.2                                                                
      R.sup.3                                                             
         R.sup.4                                                          
            R.sup.5                                                       
                 R.sup.6    X R.sup.1  Y    R.sup.16                      
                                               PREFIX//SUFFIX             
__________________________________________________________________________
457                                                                       
   H  H  CH.sub.3                                                         
            H    H          O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               4-methyl-1-propyl//        
                                               acetic acid, m.p.          
                                               191-195° C.         
458                                                                       
   H  H  H  H    5-CH.sub.3 O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               6-methyl-1-propyl//        
                                               acetic acid, m.p.          
                                               126-129° C.         
459                                                                       
   H  H  H  H    4-i-C.sub.3 H.sub.7                                      
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-isopropyl-1-propyl//     
                                               acetic acid, m.p.          
                                               164.5-165°  C.      
460                                                                       
   H  H  H  H    4-Cl       O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-chloro-1-propyl//        
                                               acetic acid, m.p.          
                                               166-169° C.         
461                                                                       
   H  H  H  H    6-OCH.sub.3                                              
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-methoxy-1-propyl//       
                                               acetic acid, m.p.          
                                               164-166° C.         
462                                                                       
   H  H  CH.sub.3                                                         
            H    H          O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-4-methyl//         
                                               acetic acid, m.p.          
                                               153-156° C.,        
                                               (Isomer A), m.p.           
                                               132-133° C          
                                               (Isomer B)                 
463                                                                       
   H  H  H  H    4-Cl       O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-chloro-1-methyl//        
                                               acetic acid, m.p.          
                                               183-184° C.         
464                                                                       
   H  H  H  H    4-C.sub.2 H.sub.5                                        
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-ethyl-1-propyl//         
                                               acetic acid, m.p.          
                                               130-131° C.         
465                                                                       
   H  CH.sub.3                                                            
         H  H    H          O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-3-methyl//         
                                               acetic acid, m.p.          
                                               147-148° C.,        
                                               (Isomer A), m.p.           
                                               145-146° C.,        
                                               (Isomer B)                 
466                                                                       
   H  H  H  H    4-CH.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-5-methyl//         
                                               acetic acid, m.p.          
                                               170-172° C.         
467                                                                       
   H  H  H  H    4-CH.sub.3 O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,5-dimethyl//acetic       
                                               acid, m.p.                 
                                               150-151° C.         
468                                                                       
   H  H  H  H    4-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-chloro-1-ethyl//         
                                               acetic acid, m.p.          
                                               154-157° C.         
469                                                                       
   H  H  CH.sub.3                                                         
            H    H          O t-C.sub.4 H.sub.9                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-t-butyl-4-methyl//       
                                               acetic acid, m.p.          
                                               179-181° C.         
470                                                                       
   H  H  H  H    4-OCH.sub.3                                              
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-methoxy-1-propyl//       
                                               acetic acid, m.p.          
                                               148-151° C.         
471                                                                       
   H  H  H  H    7-CH.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-8-methyl//         
                                               acetic acid, m.p.          
                                               160-161° C.         
472                                                                       
   H  H  CH.sub.3                                                         
            H    7-CH.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               4,8-dimethyl-1-ethyl//     
                                               acetic acid, m.p.          
                                               129-131° C.         
473                                                                       
   H  H  CH.sub.3                                                         
            H    7-CH.sub.3 O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,4,8-trimethyl//          
                                               acetic acid, m.p.          
                                               157-159° C.         
474                                                                       
   H  H  H  H    7-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-1-ethyl//         
                                               acetic acid, m.p.          
                                               168-171° C.         
475                                                                       
   H  H  H  H    6-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-chloro-1-ethyl//         
                                               acetic acid, m.p.          
                                               182-183° C.         
476                                                                       
   H  H  H  H    6-Cl       O n-C.sub.3 H.sub.7                           
                                       CH.sub. 2 CO                       
                                            C.sub.2 H.sub.5               
                                               7-chloro-1-propyl//        
                                               acetic acid, m.p.          
                                               182-183° C.         
477                                                                       
   H  H  H  H    7-C.sub.2 H.sub.5                                        
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,8-diethyl//acetic        
                                               acid, m.p. 145-148° 
                                               C.                         
478                                                                       
   H  H  H  H    7-OCH.sub.3                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-8-methoxy//        
                                               acetic acid, m.p.          
                                               132° C.             
479                                                                       
   H  H  H  H    4-CH.sub.3                                               
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5,8-dimethyl-1-ethyl//     
                 7-CH.sub.3                    acetic acid, m.p.          
                                               175-176° C.         
480                                                                       
   H  H  H  H    4-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5,8-dichloro-1-ethyl//     
                 7-Cl                          acetic acid, m.p.          
                                               168-169° C.         
481                                                                       
   H  H  H  H    6-Cl       O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7,8-dichloro-1-propyl//    
                 7-Cl                          acetic acid                
482                                                                       
   H  H  H  H    4-Cl       O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5,7-dichloro-1-methyl//    
                 6-Cl                          acetic acid                
483                                                                       
   H  H  H  H    4-CH.sub.3                                               
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-1-ethyl-          
                 7-Cl                          5-methyl//acetic           
                                               acid                       
484                                                                       
   H  H  H  H    4-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-chloro-1-ethyl-8-        
                 7-CH.sub.3                    methyl//acetic acid        
485                                                                       
   H  H  CH.sub.3                                                         
            H    4-C.sub.2 H.sub.5                                        
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-bromo-1,5-diethyl-       
                 6-Br                          4-methyl//acetic           
                                               acid                       
486                                                                       
   H  H  H  H    6-Cl       O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-chloro-1,8-dimethyl//    
                 7-CH.sub.3                    acetic acid                
487                                                                       
   H  H  CH.sub.3                                                         
            H    4-Cl       O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,4-dimethyl-5,7,8-        
                 6-Cl                          trichloro//acetic          
                 7-Cl                          acid                       
488                                                                       
   H  H  H  H    4-OCH.sub.3                                              
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-propyl-5,6,7,8-          
                 5-OCH.sub.3                   tetramethoxy//             
                 6-OCH.sub.3                   acetic acid                
                 7-OCH.sub.3                                              
489                                                                       
   H  H  H  H    4-OCH.sub.3                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-1-ethyl-5-        
                 7-Cl                          methoxy//acetic            
                                               acid                       
490                                                                       
   H  H  CH.sub.3                                                         
            H    4-OCH.sub.3                                              
                            O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7,8-dichloro-1-            
                 6-Cl                          methyl-5-methoxy//         
                 7-Cl                          acetic acid                
491                                                                       
   H  H  H  H    4-OCH.sub.3                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-5,8-di-            
                 7-OCH.sub.3                   methoxy//acetic acid,      
                                               m.p. 167-169° C.    
492                                                                       
   CH.sub.3                                                               
      H  H  H    4-F        O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-5-fluoro-3-       
                 7-Cl                          methyl-1-propyl//          
                                               acetic acid                
493                                                                       
   H  H  H  H    4-F        O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7,8-dichloro-5-            
                 6-Cl                          fluoro-1-ethyl//           
                 7-Cl                          acetic acid                
494                                                                       
   C.sub.2 H.sub.5                                                        
      H  CH.sub.3                                                         
            H    4-CF.sub.3                                               
                            O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               3-ethyl-5-trifluoro-       
                 7-CH.sub.3                    methyl-1,4,8-              
                                               trimethyl//acetic          
                                               acid                       
495                                                                       
   H  H  H  H    6-CF.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-7-trifluoro-       
                                               methyl//acetic acid,       
                                               m.p. 185-187° C.    
496                                                                       
   H  H  CH.sub.3                                                         
            H    7-CF.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-4-methyl-8-        
                                               trifluoromethyl//          
                                               acetic acid                
497                                                                       
   H  H  C.sub.2 H.sub.5                                                  
            H    5-CH.sub.3                                               
                            O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,6-dimethyl-4-ethyl-      
                 7-NO.sub.2                    8-nitro//acetic acid       
498                                                                       
   CH.sub.3                                                               
      H  H  H    4-NO.sub.2                                               
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-3-methyl-5-       
                 7-Cl                          nitro-1-propyl//           
                                               acetic acid                
499                                                                       
   H  H  H  H    5-SH       O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               6-mercapto-1-methyl//      
                                               acetic acid                
500                                                                       
   H  H  CH.sub.3                                                         
            H    7-SCH.sub.3                                              
                            O CH.sub.3 CH.sub.2                           
                                            C.sub.2 H.sub.5               
                                               1,4-dimethyl-8-methyl-     
                                       CH.sub.2 CO                        
                                               thio//propionic acid       
501                                                                       
   H  H  H  H    6-SC.sub.2 H.sub.5                                       
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-7-ethylthio//      
                                               acetic acid                
502                                                                       
   H  H  H  H    4-NH.sub.2 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               5-amino-1-ethyl//          
                                               acetic acid                
503                                                                       
   H  H  H  H    6-NH.sub.2 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-amino-1-ethyl//          
                                               acetic acid                
504                                                                       
   H  H  H  H    4-SO.sub.2 NH.sub.2                                      
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-propyl-5-sulfamoyl//     
                                               acetic acid                
505                                                                       
   H  H  H  H    6-SO.sub.2 NH.sub.2                                      
                            O CH.sub.3 CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-methyl-7-sulfamoyl//     
                                               acetic acid                
506                                                                       
   H  H  H  H    H          O                                             
                               ##STR123##                                 
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-cyclopropyl//acetic      
                                               acid, m.p. 128-129° 
                                               C.                         
507                                                                       
   H  H  H  H    H          O                                             
                               ##STR124##                                 
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-benzyl//acetic acid,     
                                               m.p. 139-141° C.    
508                                                                       
   H  H  H  H    5-F        O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-6-fluoro//         
                                               acetic acid, m.p.          
                                               125-126° C.         
509                                                                       
   H  H  CH.sub.3                                                         
            H    6-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-chloro-1-ethyl-          
                                               4-methyl//acetic acid      
                                               m.p. 141 -143° C.   
510                                                                       
   H  H  H  H    6-F        O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-7-fluoro//         
                                               acetic acid, m.p.          
                                               164-166° C.         
511                                                                       
   H  H  CH.sub.3                                                         
            H    7-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-1-ethyl-          
                                               4-methyl//acetic acid,     
                                               m.p. 157-163° C.    
512                                                                       
   H  H  CH.sub.3                                                         
            H    7-C.sub.2 H.sub.5                                        
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,8-diethyl-4-methyl//     
                                               acetic acid, m.p.          
                                               125-130° C.         
513                                                                       
   H  H  H  H    7-n-C.sub.3 H.sub.7                                      
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-8-propyl//         
                                               acetic acid, m.p.          
                                               111-114° C.         
514                                                                       
   H  H  H  H    7-(CH.sub.3).sub.2                                       
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-8-isopropyl//      
                 CH                            acetic acid, m.p.          
                                               165-167° C.         
515                                                                       
   H  H  H  H    7-n-C.sub.4 H.sub.9                                      
                            O C.sub.2 H.sub.5                             
                                       CH.sub. 2 CO                       
                                            C.sub.2 H.sub.5               
                                               8-butyl-1-ethyl//          
                                               acetic acid, nmr           
                                               (CDCl.sub.3) δ 1.0   
                                               (t,                        
                                               J=7, 6H), 6.9-7.11         
                                               (m,3H)                     
516                                                                       
   H  H  H  H    7-sec-     O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-sec-butyl-1-ethyl//      
                 C.sub.4 H.sub.9               acetic acid, m.p.          
                                               135-137° C.         
517                                                                       
   H  H  H  H    7-(CH.sub.3).sub.2                                       
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-8-isobutyl//       
                 CHCH.sub.2                    acetic acid, nmr           
                                               (CDCl.sub.3)               
                                               δ 0.9 (m, 9H),       
                                               7.0-7.5                    
                                               (m,3H)                     
518                                                                       
   H  H  H  H    7-tert-    O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-tert-butyl-1-ethyl//     
                 C.sub.4 H.sub.9               acetic acid, m.p.          
                                               169-170° C.         
519                                                                       
   H  H  CH.sub.3                                                         
            H    4-CH.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub. 2 H.sub.5              
                                               1-ethyl-4,5,8-trimethyl//  
               {          }                    acetic acid, m.p. 167-     
                 7-CH.sub.3                    168° C.             
520                                                                       
   H  H  H  H    6-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7,8-dichloro-1-ethyl//     
                 {        }                    acetic acid, m.p. 112-     
                                               117° C.             
521                                                                       
   H  H  H  H    6-CH.sub.3 O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-chloro-1-ethyl-7-        
               {          }                    methyl//acetic acid,       
                 7-Cl                          m.p. 117-120° C.    
522                                                                       
   H  H  H  H    6-Cl       O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-chloro-1-ethyl-8-        
               {          }                    methyl//acetic acid,       
523              7-CH.sub.3                    m.p. 119-123°       
   H  H  H  H    6-F        O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-7-fluoro-8-        
               {          }                    methyl//acetic acid,       
                 7-CH.sub.3                    m.p. 158-160° C.    
524                                                                       
   H  H  H  H    7-C.sub.2 H.sub.5                                        
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-ethyl-1-propyl//         
                                               acetic acid, m.p.          
                                               103-105° C.         
525                                                                       
   H  H  H  H    7-n-C.sub.3                                              
                            O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1,8-dipropyl//acetic       
                 H.sub.7                       acid, m.p. 109° C.  
526                                                                       
   H  H  H  H    6-Cl       O n-C.sub.3 H.sub.7                           
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               7-chloro-8-methyl-1-       
               {          }                    propyl//acetic acid,       
                 7-CH.sub.3                    m.p. 156-158° C.    
527                                                                       
   H  H  H  H                                                             
                  ##STR125##                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-cyclopropyl-1-ethyl//    
                                               acetic acid, m.p.          
                                               153-sd,18 154° C.   
528                                                                       
   H  H  H  H                                                             
                  ##STR126##                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-cyclopentyl-1-ethyl//    
                                               acetic acid, m.p. 137-     
                                               139° C.             
529                                                                       
   H  H  H  H                                                             
                  ##STR127##                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               8-cyclohexyl-1-ethyl//     
                                               acetic acid, m.p. 156-     
                                               159° C.             
530                                                                       
   H  H  H  H                                                             
                  ##STR128##                                              
                            O C.sub.2 H.sub.5                             
                                       CH.sub.2 CO                        
                                            C.sub.2 H.sub.5               
                                               1-ethyl-8-phenyl// acetic  
                                               acid, m.p. 184-187° 
                                               C.                         
__________________________________________________________________________

Claims

We claim:

1. A compound of the formula Ia ##STR129## in which R¹ is selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl, lower cycloalkyl, phenyl, benzyl and 2-thienyl, R², R³, R⁴ and R⁵ are the same or different and are each selected from the group consisting of hydrogen and lower alkyl, R^6a, R^6b, R^6c, and R^6d are the same or different and selected from the group consisting of lower cycloalkyl and phenyl R⁷ is selected from the group consisting of hydrogen, lower alkyl and lower alkenyl, X is selected from the group consisting of oxy and thio, Y is selected from the group consisting of carbonyl, ##STR130## which each of R⁸, R⁹, R¹⁰, R¹¹ , R¹² and R¹³ is hydrogen or lower alkyl, and Z is selected from the group consisting of hydroxy and lower alkoxy.

2. 8-Cyclopropyl-1-ethyl-1,3,4,9-tetrahydropyrano[3,4-b]-indole-1-acetic acid, as claimed in claim 1.

3. 8-Cyclopentyl-1-ethyl-1,3,4,9-tetrahydropyrano[3,4-b]-indole-1-acetic acid, as claimed in claim 1.

4. 8-Cyclohexyl-1-ethyl-1,3,4,9-tetrahydropyrano[3,4-b]-indole-1-acetic acid, as claimed in claim 1.

5. 1-Ethyl-8-phenyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid, as claimed in claim 1.

6. A method of treating inflammation in a warm-blooded animal, comprising: administering perorally to said animal an antiinflammatorily effective amount of the compound of the following formula Ib ##STR131## in which R¹ is selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl, lower cycloalkyl, phenyl, benzyl and 2-thienyl, R², R³, R⁴ and R⁵ are the same or different and are each selected from the group consisting of hydrogen and lower alkyl, R^6a, R^6b, R^6c, and R^6d are the same or different and selected from the group consisting of hydrogen, lower alkyl, lower cycloalkyl, hydroxy, lower alkoxy, benzyloxy, lower alkanoyloxy, phenyl, nitro, halo, mercapto, lower alkylthio, trifluoromethyl, amino and sulfamoyl, R⁷ is selected from the group consisting of hydrogen, lower alkyl and lower alkenyl, X is selected from the group consisting of oxy and thio, Y is selected from the group consisting of carbonyl, ##STR132## which each of R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ is hydrogen or lower alkyl, and Z is selected from the group consisting of hydroxy and lower alkoxy.

7. A method of producing analgesia in a warm-blooded animal, comprising: administering perorally to said animal an analgesically effective amount of the compound of formula 1b of claim 6.

8. A pharmaceutical composition comprising: an anti-inflammatory effective amount of the compound of formula 1b of claim 6 and a pharmaceutically acceptable carrier.

9. A pharmaceutical composition, comprising: an analgesically effective amount of the compound of Formula 1b of claim 6 and a pharmaceutically acceptable carrier.

10. A method according to claim 6 wherein 1-propyl-1,3,4,9,tetrahydropyrano[3,4-b]indole-1-acetic acid is the compound administered.

11. A method according to claim 6 wherein 1,8-diethyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid is the compound administered.

12. A method according to claim 7 wherein 1-propyl-1,3,4,9,tetrahydropyrano[3,4-b]indole-1-acetic acid is the compound administered.

13. A method according to claim 7 wherein 1,8-diethyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid is the compound administered.

14. A pharmaceutical composition according to claim 8 wherein the compound of Formula 1b is 1-propyl-1,3,4,9,-tetrahydropyrano[3,4-b]indole-1-acetic acid.

15. A pharmaceutical composition according to claim 8 wherein the compound of Formula 1b is 1,8-diethyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid.

16. A pharmaceutical composition according to claim 9 wherein the compound of Formula 1b is 1-propyl-1,3,4,9,tetrahydropyrano[3,4-b]indole-1-acetic acid.

17. A pharmaceutical composition according to claim 9 wherein the compound of Formula 1b is 1,8-diethyl-1,3,4,9-tetrahydropyrano-[3,4-b]indole-1-acetic acid.